Smaller teeth and jaws are due to genetic variation, which occurred by mutations (errors in DNA replication) and were selected to fill a suitable niche.
What is evolution?Evolution is the mechanism of change of one species to adapt given environment, whereas mutations are the raw material for evolution.
In this regard, scientific evidence supports the fact that jaws evolved to become shorter in humans and thus adapt to a pastoral lifestyle.
In conclusion, smaller teeth and jaws emerged by mutations and were selected to fill a suitable niche.
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What is an equinox? Select all that apply.
the day in Earth's orbit when sunlight and darkness are of equal lengths
the day in Earth's orbit when sunlight is longer than darkness
the day in Earth's orbit that marks the beginning of spring or autumn
the day in Earth's orbit that marks the beginning of summer or winter
Answer:
The day in Earth's orbit when sunlight and darkness are of equal lengths
The day in Earth's orbit that marks the beginning of spring or autumn
Explanation:
A farmer stopped maintaining a field that was once used to grow crops. Over time, the field eventually became a forest. These changes best illustrate the process of
These changes best illustrate the process of plants.
The kingdom Plantae contains eukaryotes that are mostly photosynthetic. Algae and fungi were once included in the plant kingdom, which historically included all other living creatures save animals. However, prokaryotes, fungi, and some types of algae are not included in any modern definitions of the Plantae.
Plants are essential to the ecology because they help with the nitrogen cycle, prevent soil erosion, and participate in the water cycle. Although they also create oxygen, plants are a significant source of food. For humans to exist, it is essential that plants flourish.
One of the simplest methods to enhance the environment and enhance your surroundings is to plant a tree. Plants help to prevent soil erosion by filtering contaminants, absorbing carbon dioxide, and releasing oxygen. It will also assist to lessen your carbon footprint if you plant a few trees.
hence, The farmer ceased preserving the land because plants grew over time.
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How much faster than normal extinction have humans caused extinction rates to climb?
atleast 1,000 times or more.
What is/are the main purpose(s) of mitosis? (select all that apply)
Control metabolism
Synthesize energy
Generate genetic diversity
Organism growth
Tissue repair and maintenance
Create gametes
Answer:
Synthesize energy
Tissue repair and maintenance
Explanation:
Mitosis is a stage in the cell cycle where the produced DNA is separated and two new cells are generated with the equal number of DNA and type of chromosomes as the parent nucleus.
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Answer: The main purposes of mitosis are Organism growth and tissue repair and maintenance.
Explanation: MITOSIS is the step of cell division in cell cycle. Cell cycle contains G1 S G2 and M phase. During mitosis a cell replicates its chromosome and segregates them to produce two identical daughter nuclei, which after undergoing cytokinesis produces two identical daughter cells. mitosis is often called as equational division.
Mitosis do not control metabolism nor it synthesize energy.
MITOSIS produces two identical daughter cells which are identical to their parents, so it cannot cause genetic diversity.
mitosis helps organism to grow in size and tissue repair and maintenance by producing new cells identical to each other.
gametes are not produced by mitosis they are produced by meiosis that is reductional division.
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What organelles do plants have in their roots that helps them to sense gravity?
a) stigma
b) statocyte
c) starch
d) stamen
statocytes, organelles do plants have in their roots that helps them to sense gravity, correct answer is B.
what are statocytes ?
In higher plants, statocytes are the cells which sense gravity. They contain amyloplasts-statoliths, amyloplastic organelles which are filled by starch or sediment at the bottom of the cells. Coleoptiles, shoots, and inflorescence stems all have an elongating area that really is home to statocytes.
how do they help in sensing gravity ?
When the plant is reoriented in the gravity field, the starch-filled plastids (also known as statoliths) in the statocytes, that are highly polarized cells, fall to the physical bottom.
Hence, statocytes help in sensing gravity.
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A proton gradient is an important part of both photosynthesis and cellular respiration.
For either photosynthesis or cellular respiration, describe how the proton gradient is established and what the proton gradient is used for.
A proton gradient is an important part of both photosynthesis and cellular respiration because couple the favorable flow of H+ to transport specific metabolites into and out of organelles.
What is the proton gradient?The gradient is sometimes called the proton-motive and can be thought of as a form of energy, force and force in a battery. Like other ions, protons are not able to cross directly through the phospholipid bilayer of the membrane, as the interior of the membrane is hydrophobic.
The proton gradient generated by this manipulation provided a driving force for ATP synthesis in the absence of light. This confirms the chemiosmotic theory, where a chemical potential across the membrane can provide energy for ATP synthesis.
The proton gradient produced by pumping protons during the electron transport chain is used to synthesize ATP.
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Describe the role of the hypothalamus and the adrenal glands in bringing about changes in the blood vessels in the human skin and explain why these changes occur.
The role of the hypothalamus and the adrenal glands is The hypothalamus stimulates corticotropin-releasing hormone (CRH) that stimulates the pituitary gland to perspire adrenocorticotropin hormone (ACTH). ACTH then prompts the adrenal glands to make and release cortisol hormones into the blood.
What are the responsibilities of the adrenal glands?Adrenal glands are endocrine glands found on top of your kidneys. They produce many essential hormones, including cortisol, aldosterone and adrenaline. The adrenal hormones help control several bodily functions including metabolism, blood pressure and your body's reaction to stress.
What is the function of the hypothalamus?hypothalamus, a system deep in your brain, acts as your body's smart control coordinating center. Its main role is to keep your body in a stable state called homeostasis.
It does its job by directly influencing your autonomic nervous system or by controlling hormones.
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look at the picture
Answer:
B
Explanation:
PLEASE ANSWER QUICK
What is the renewability of geothermal power?
It is a nonrenewable energy source.
It is an unlimited, clean energy source.
It can be replenished by splitting nuclei.
It can use the same fuel cells repeatedly.
Question 14 of 25
A student drew the following flowchart to show the movement of nutrients.
Soil → Roots → Plants → Animals
Which process is likely to be occurring in the plant's roots?
OA. Photosynthesis
OB. Nitrogen fixation
OC. Burning of fossil fuels
O D. Water transpiration
The process likely to be occurring in the plant's roots will be nitrogen fixation.
What is nitrogen fixation?It is a process whereby atmospheric nitrogen is converted to usable forms of nitrogen in the soil.
Nitrogen fixation takes place in the root nodules of leguminous plants in association with some symbiotic bacteria.
Thus, the only process that could be happening in the plant's root is nitrogen fixation.
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What happens to the trees in the taiga as global temperatures rise?
They grow bigger and use more resources.
They lose their needles in the winter.
They grow farther up the mountains.
They grow farther down the mountains.
Answer:
C
Explanation:
because they grow more than others time
Early in genetic research, it was suggested that the genetic code might be made up of overlapping codons in which the last two bases of one codon make up the first two bases of the next codon, as below:
mRNA codons
overlapping code GGUAUA 1st codon = GGU
2nd codon = GUA
nonoverlapping code GGUAUA 1st codon = GGU
2nd codon = AUA
Supposing it were discovered that, in a life-form from another planet, even a single base pair substitution in the DNA caused three adjacent amino acid changes in the protein coded for. Would you conclude that the code was overlapping or nonoverlapping? Explain your logic.
The genetic code is called non-overlapping because adjacent codons can not overlap, whereas in this case, the code is overlapping.
What does 'overlapping code' mean?The genetic code does not overlap because the same nucleotide in the sequence cannot be used to encode two different codons.
In genetics, overlapping refers to a feature of the genetic code associated with how this nucleotide code is read.
In conclusion, the genetic code in this case is overlapping.
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How can you use more renewable sources of energy? Select all that apply.
Use carpools or public transportation.
Stop using all forms of energy altogether.
Grow your own food and buy local products.
Wait for governments to make laws.
Answer: a and c
Explanation: You don't need to wait on the government to make laws to be able to be energy efficient, nor do you have to stop using all forms of energy altogether.
The data in the graph are the result of a paramecium being placed in a hypertonic salt solution.
A graph entitled Paramecium Contractile Vacuole Contractions has salt concentration on the horizontal axis and contractions per minute on the vertical axis. A very low salt concentration has 30 contractions per minute, low: 22, medium: 15, high: 8, very-high: 2.
Based on the data in the graph, which would most likely happen if the paramecium were placed in distilled water?
The contractions would increase.
The contractions would decrease.
The contractions would cease altogether.
The contractions would establish dynamic equilibrium.
The contraction will increase. The first option is the correct option.
What is the contractile vacuole?It is an organ that helps to excrete excess water from the body of some protozoans such as paramecium.
The more excess water present in the organism, the more the contractile vacuole contracts to get rid of the water.
With distilled water, more water will enter the cell and this excess water will need to be gotten rid of. Thus, the contraction rate will increase.
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Answer:
A
Explanation:
Dr. Gonzelez's psychiatric patient reports that last week she stayed up for three days writing because she felt incredibly energetic and creative. She reported to her therapy session looking tired and had not showered or changed clothes for several days. What disorder most fits the patient's symptoms?
A specific phobia
Major depressive disorder
Bipolar disorder
Generalized anxiety disorder
Answer:
The best treatment for specific phobias is a form of psychotherapy called exposure therapy. Sometimes your doctor may also recommend other therapies or medication. Understanding the cause of a phobia is actually less important than focusing on how to treat the avoidance behavior that has developed over time
Explanation:
The disorder that most fits the patient's symptoms is a bipolar disorder. The correct option is C.
What is bipolar disorder?Bipolar people have episodes of severe depression as well as episodes of mania, which include overwhelming joy, excitement, or happiness, enormous energy, a reduced need for sleep, and reduced inhibitions. Bipolar disorder is a highly individual experience.
The symptoms of bipolar disorder are frequently triggered by a stressful circumstance or situation. A relationship breakdown is an example of a stressful trigger. Abuse can be physical, intimate, or emotional.
Bipolar disorder is characterized by extreme mood swings that are unpredictable and frequently disrupt daily functioning.
According to Dr. Gonzelez's psychiatric patient, she stayed up for three days last week writing because she felt incredibly energetic and creative.
She arrived at her therapy session exhausted, having not showered or changed clothes in several days; the disorder that best fits the patient's symptoms is a bipolar disorder.
Thus, the correct option is C.
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You have a pea plant with a yellow pea phenotype but do not know if the genotype is homozygous (YY) or heterozygous (Yy). What type of cross would you do determine the genotype of this plant and what would be the predicted phenotypes of the offspring?
A test cross must be performed to ascertain this plant's genotype. Yellow and green peas are the anticipated phenotypes of the progeny.
What is a test -cross?To ascertain whether a progeny is homozygous or heterozygous for a given trait, an F1 progeny is crossed with a double (homozygous) recessive parental progeny (green pea). This is referred to as a test cross.
All of the hybrid's offspring will exhibit the dominant (yellow) phenotype if the mother is homozygous (YY) dominant.
Mother yellow pea (YY) x green pea (yy) - P generation
Y y - Gamete
Yy (yellow) , Yy (yellow) -F1 generation
If the mother is heterozygous dominant(Yy), then half of the offspring will exhibit the dominant phenotype and the other half will exhibit the recessive phenotype and the ratio should be 1:1.
Mother yellow pea (Yy) x green pea (yy) -P generation
Y, y y - Gamete
Yy (yellow) , yy (green) -F1 generation
Therefore, it is concluded from the above explanation that we have to perform a test-cross to know the genotype of the pea plant.
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Which of the following is a nitrate?
A. NO3 -
B. NO2 -
C. NH3
D. N2
Answer:
A.) NO₃⁻
Explanation:
NO₃⁻ = nitrate
NO₂⁻ = nitrite
NH₃ = ammonia
N₂ = nitrogen (nitrogen naturally exists as a diatomic molecule)
You conduct an experiment to determine the concentration of ions in an unknown solution. You place 300mL inside a dialysis bag and place the bag into a beaker of water with an ion concentration of 100 ppm (parts per million). When you check the experiment an hour later, the bag is swollen and has taken in water. What can you conclude?
The conclusion is that water has moved from the beaker into the bag by osmosis because concentration of solute in the beaker is lower than that in the bag.
What is osmosis?Osmosis is the movement of water molecules across a semipermeable membrane from a solution of low solute concentration to one of high solute concentration.
The concentration of solute in the beaker is lower than that in the bag, therefore, water will move from the beaker into the bag by osmosis.
In conclusion, the solution in the beaker is of lower solute concentration than in the bag.
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If you observed that the Sun did not set during an entire 24-hour period of time during the summer months of June, July, and August, where are you most likely located?
South Pole
a location in the mid-latitudes
North Pole
near the Equator
The correct option is (c). We are supposed to be located in the north pole. This is due to Arctic circle phenomenon.
What is Arctic circle phenomenon?
Arctic circle phenomenon means that the sun does not set above this latitude during the summer months. Arctic circle is an imaginary line. North pole of the Arctic circle faces the periods of constant sunshine mainly during the summer months of june, july and august. This occurs due to the fact that Earth is tilted at its axis by 23 degress and during its rotation in summer months it's North pole gets aligned towards our star. For example, northmost parts of Norway.
That's why the Sun did not set during an entire 24 hour period of time during summer months of june,july and august.
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Identify the results of humans removing large amounts of Earth's vegetation. Select all that apply.
Earth cannot control climate.
Earth cannot control chemistry.
Earth cannot control water.
Earth cannot control volcanoes.
Answer:
Earth cannot control chemistry
The formation of the many kinds of body cells that make up an embryo begins with
The formation of multicellular organisms commences with a single-celled zygote, which divides rapidly to form the blastula. Cleavage refers to the rapid, multiple shots of cell division.
What is an embryo?Following conception, the baby enters the embryonic stage, a period of radical shift.
This stage lasts from the fifth to the tenth week of pregnancy. During a certain stage, the baby is referred to as an embryo. Several changes take place even during embryonic stage.
The primary distinction between an egg and an embryo is that an embryo is formed after the gametes are fertilized, whereas an egg is extracted from the ovary and stored in a freezer prior to fertilization.
Thus, multicellular organisms begin with a single-celled zygote that divides speedily to form the blastula. Cleavage is a term that refers to rapid, multiple strikes of cell division.
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Answer:2
Explanation:because lk
As we learned in the lesson, Excel can be used in the workplace, but it can also be used at home. For example, a
great use for Excel is to create a weekly budget to help track and plan your monthly spending. Thinking about what
you have learned in this lecture to explain how you would use Excel to help you organize your finances.
Here are some prompts to consider:
Describe how a budget can help you ensure that you spend your money wisely.
.
. Explain how you would arrange the columns and rows to accomplish your task.
Identify how you could use color and cell borders to accent the cells.
. Consider the types of expenses you would track and how you prioritize them.
Highlight how you might include some of Excel's functions into your budget.
Excel can be used to organize finances and find out the future trends of income and expenditure.
How do you use Excel to organize finances?First you have to structure your personal budget spreadsheet. Then organize Your Budget using shading method. After that use Excel formulas to project your account balances into the Future. Calculate Payments and eliminate your debt. Excel sheet has many formulas on it which make the calculations better and very quick. This excel sheet has high importance in the budget making and organize finance.
So we can conclude that excel can be used to organize finances and find out the future trends of income and expenditure.
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Identify the structures in the cell pictured on the right.
Label A
Label B
Label C
Label D
Label A - Nucleus
Label B - Cytoplasm
Label C - Ribosome
Label D - DNA
Organelles of a cell
The picture is that of an animal cell.
The parts labeled A, B, C, and D respectively are the nucleus, the cytoplasm, the ribosome, and the cell's DNA.
The nucleus is located centrally and controls the activities of the cell. It is a double membrane organelle that house the genome of the cell. Materials are able to move in and out of the nucleus while the nuclear membrane act as a selectively permeable membrane.
The cytoplasm represents the inner content of the cell. It consists of the inner organelles and the liquid content, otherwise known as the cytosol.
The ribosome is a small spherical organelle that functions in the synthesis of proteins. Some ribosomes lie freely within the cytoplasm while others are found attached to another organelle known as the endoplasmic reticulum.
The DNA is located inside the nucleus. It is the molecule responsible for the transfer of traits from parents to offspring.
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Which results from an increase in the greenhouse effect?
Answer:
nitrogen?
Explanation:
Burning fossil fuels like coal and oil puts more carbon dioxide into our atmosphere. NASA has observed increases in the amount of carbon dioxide and some other greenhouse gases in our atmosphere. Too much of these greenhouse gases can cause Earth's atmosphere to trap more and more heat. This causes Earth to warm up.
Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
which of these urinary hydration biomarkers provides the best index of day-to-day hydration? a) urine color B) urine concentration. C) plasma osmolality. D) plasma volume
Answer: urine concentration is the best answer to this question
Explanation:
Urinary hydration biomarkers provide the best index of day-to-day hydration is urine concentration.
The answer is option B.urine concentration
What is the best index for day-to-day hydration?Plasma osmolality, urine osmolality, and urine particular gravity are the maximum widely used markers of hydration. however, urine shade has also been used with reasonable accuracy while laboratory analysis isn't to be had or while a short estimate of hydration is vital.one of the easiest methods to check your hydration is thru toilet frequency and urine color. urine should be light yellow and also you have to be emptying our bladder on common 5-8 instances according to day. some other way to decide hydration stages (especially after a run) is a sweat take a look.Learn more about urinary hydration here:-https://brainly.com/question/1301665
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Based on your knowledge of flowers, why do you think most flowers are bright in color?
Most flowers are bright in color because it is attractive to pollinators.
What is adaptation?An adaptation is any phenotypic trait that confers an evolutionary advantage to an individual.
Most flowers are bright in color because it is attractive to pollinators, which is required to transport pollen to other flowers and thus increase the genetic variation in the plant population.
In conclusion, flowers are bright in color to attract pollinators.
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Why are microorganisms used to produce enzymes?
If possible, focus on the production of pharmaceutical enzymes via microorganisms, but a general explanation is sufficient as well.
Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
Why are microorganisms used to produce enzymes?
Microbial enzyme production occur to degrade natural polymers such as proteins, starches, or pectin. The microorganisms secrete the enzymes in order to extract nutrients from it.
So we can conclude that Microorganisms produce enzymes in order to break the macromolecules such as proteins and starches.
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For a mitocondria.
The hydrogen ion reservoir is located in the ______________________________ and ATP is synthesized in the ____________________.
Answer
For a mitocondria.
The hydrogen ion reservoir is located in the matrix and ATP is synthesized in the inner mitochondrial membrane.
Drag the tiles to the correct boxes to complete the pairs.
Match each step of the scientific method with its description. see image ...........................................
Making observations: Bread, when kept in the open for a long time, shows the presence of mold
Asking questions: What causes mold growth on bread?
Constructing hypotheses: Changes in temperature may affect the growth of mold on bread
Testing hypothesis: Keep the bread in different locations, changing the temperature at each location
Result analysis and conclusion: Increased temperature leads to mold growth on bread
Result communication: Make a presentation of the data and explain it to the class.
Scientific methodThe scientific method is a rational order of steps through which scientific knowledge is obtained. The steps are:
Making observationsAsking questionsConstructing hypothesesTesting hypothesisResult analysis and conclusionResult communicationObservations have to do with making perceptions about events. Next is asking questions about why those events are the way they are.
Guesses are made to answer the questions raised. This represents the hypothesis stage.
Next is to test the correctness of the hypothesis using suitable experiments.
Results from the experiment are analyzed using relevant statistical analysis and conclusions are made from there.
The outcome of the whole procedure is then communicated to the scientific world.
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What is thWhich is a structure that directs the cell's activities?e basic unit of structure and function of all living organisms?
The nucleus is the structure that directs the cell's activities of living organisms.
What is Nucleus?This is an organelle which is usually membrane bound and contains the chromosomes.
It is involved in the control of the synthesis of proteins thereby aiding the directing of the cell activities.
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