what was the first life form on earth based on the diagram above
Answer:
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.
Explanation:
scientists often test their hypotheses with controlled experiments. which of these is a rule for conducting a controlled experiment?
a. change at least two variables at a time
b. keep all variables constant
c. change as many variables as possible
d. change only one variable at a time
Changing only one variable at a time is a rule for conducting a controlled
experiment.
Controlled experiment involves the use of dependent and independent
variables . Changes in the independent variable brings about a
corresponding change in the dependent variable which is then recorded.
It is however important to note that changing more than only one variable at
a time won't accurately determine if the changes in the results were as a
result of one cause. This is why only one variable has to be changed at a
time.
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what are the three parts of the data analysis section of a lab report?
Answer:
1) rough reading
2)initial reading
3)final reading
Explanation:
those three are always important for every lab report
The average level of glucose (also known as blood sugar in a person) is 85 mg/100 mL of blood. If the person has 5.1liters of blood, how many milligrams of glucose are present in the blood
Answer:
The average level of glucose (also known as blood sugar in a person) is 85 mg/100 mL of blood. If the person has 5.1 liters of blood, how many milligrams of glucose are present in the blood? a. 17 mgb.1.7 x 10-4 mg C. 4.3 mg d.4.3 x 103 mg e. 121 mg
Are there any differences between what we need as humans and what animals need? If so, what?
Answer:
Animal society is mainly based on instincts or reflex behavior, whereas human society is based on reason or rational behavior. There are no rights and duties in animal society. Every animal lives upon his physical powers whereas human society has a wonderful system of law and order.
Animals usually live in the wild where they have to find there own food and hunt for it, where we as humans spend money on our food and it is all at the grocery store. There are more differences but this is one main difference.
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i have a leopard gecko and its heat lamp bulb burnt out will it be ok until tomorrow? sorry i have no friends to ask yk
In translation What are are the three letters called in mRNA and what are they connected to ??
Answer:
During translation, the ribosome reads 3 letters at a time on the mRNA strand called a codon. The anticodons, which are connected to the amino acid, match up with the letters on the mRNA strand
Explanation:
what valve separates two chambers and how do they function by preventing the
blood to go to what direction?
Answer:
bicuspid and tricuspid valve
Explanation:
Tricuspid valve separates right auricle and ventrical whereas bicuspid separates left auricle and ventrical.
they help by preventing the back flow of the blood by avoiding them to go to the position where they came from.
what is an example of something that keeps our genes heathy ?
Answer:
I guess I would say water
What is purebred breeding?
A: A form of Straight Breeding with related animals?
B: A form of straight breeding with non-related animals
C: A form of straight breeding with registered animals
D: A form of straight breeding with grade females and purebred sires.
A: A form of Straight Breeding with related animals
please help me match these up click the photo to see it better
What determines whether an crop is a spring annual,
summer annual, or winter annual?
Agriculture is commonly described as the science or art of farming. What determines them is climate, temperature, cold, if seed can be sown outdoors in the spring , the ability to withstand early spring and fall frosts and winter temperatures.
Summer annual crops are known to germinate, flower, produce seed, and die by frost amidst the warmer months of the year.Winter annuals often sprout in the late summer and autumn, it is known to be dormant during the winter, and grow during the next spring and summer. its young winter annual plants live through the winter then flower, set seed and die out the following summer.
Winter annuals often bloom in winter or spring. They grows in very low to the ground. Examples are henbit, deadnettle, chickweed etc. Spring annuals are known to sprout early in the spring.
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Why do we discuss crude birth and death rates in environmental science?
A. it is too difficult to calculate the regular birth rate
B. it is too difficult to calculate the regular death rate
C. allows us to compare the populations of different
countries
D. because that's the way we've always done it
Rather than flight, what do scientists think feathers initially evolved for?
Answer:
Many Bird ancestors like dinosaurs originally had these feathers even tho they didn't fly. Bird feathers have originally been thought to be used for mate attraction or even insulation. Modern birds have many different types of feathers!
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All birds lay their eggs on land.
Which feature of birds allows the embryos in eggs to maintain homeostasis
and survive on land?
A. Hard, watertight shells
B. Specialized beaks
O C. Flexible, leathery shells
D. Insulating feathers
The theme of fly for your life
HURRYYY!!!
Answer:
gunship
Explanation:
Only 3% of the water on earth is fresh water, the kind we need for drinking and growing food. Of that 3% , how much is locked in ice caps, and permanent snow.
Answer:
2.5%
Explanation:
3. Your body needs protein. Protein is broken down into amino acids that are then used to build the
proteins your cells need to function. What is the primary source of protein in your diet? Use the
food pyramid to see what types of protein-rich foods you eat on a regular basis. (2 points)
Answer:
Explanation:
Bro here you can find the protein section at the right middle side of the image
The primary source of protein can be found in the foods which are used on a regular basis includes dairy products, poultry products, green vegetables etc.
Examples of protein- rich foods dairy products : milk, cheese, yoghurt, kefir poultry : chicken, eggslentils, salmon, fish, seafood like crabs and prawns green vegetables etc.The food pyramid shows these above mentioned foods are good source of protein that needs to be consumed.To learn more about food pyramid:
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Explain how each of the following could lead to the reemergence of malaria in the United States: (a) global warming, (b) increased travel of individuals from endemic regions to the United States, (c) increased immigration of individuals from endemic regions to the United States, and (d) laws protecting wetlands.
Answer:
(b) increased travel of individuals from endemic regions to the United States,
The possible reason that lead to the reemergence of malaria in the United States is increased travel of individuals from endemic regions to the United States. The correct option is b.
What is malaria?Malaria is a potentially fatal disease caused by a parasite that infects a specific type of mosquito that feeds on humans. Malaria typically causes severe illness, including high fevers, shaking chills, and flu-like symptoms.
Malaria is typically transmitted through the bite of an infective female Anopheles mosquito. Only Anopheles mosquitos can transmit malaria, and they must have previously been infected through a blood meal taken from an infected person.
It has been determined that mosquitoes become infectious more quickly, resulting in increased malaria transmission and increased travel from endemic regions to the United States.
Thus, the correct option is b.
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What is it called when a new cell expresses the traits of a skin cell?
cell specialization
cell reproduction
ocell replication
cell division
Answer:
cell specialization I think
After surgery to repair burst fractures of his C6 and C7 vertebrae, Luke was transferred to the surgical intensive care unit. Which of the following healthcare professionals would most likely provide, coordinate, and implement Luke's care; administer medications; assess/monitor his status; and educate/support Luke and his family about his injury and care?
Answer:
A neurologist specializes on spinal injuries so he/she would be treating Luke.
What are the two kingdoms of prokayotic organism?
Answer: Bacteria and Archaea
Explanation:
how to make soap without the use of oil.
Answer:
its impossible
Explanation:
Helpppppppppp HELPPPP
What two things must happen for there to be a proxigean spring tide?
full moon and the closet perigee
new moon and the furthest apogee
new moon and the closest perigee
full moon and the furthest apogee
Answer:
Full or New Moon + Perigee
How does freshwater enter the aquifer ?
Answer:
some sort of water system, (a river/groundwater/purification plant ect.)
Explanation:
Help me solve this question please
Answer:
where is the question .....?????
which two organisms are closely related?
While orangutans and gorillas are in the great ape family, humans are most closely related to two other species in the family: bonobos and chimpanzees.
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Answer:
orangatangs and gorrilas are a prime example of close inheritance
Explanation:
These two species are the two closest related species
the two pathways fundamentally involved in the physiological response to stress are
A. HPA and CRH
B. SAM and PVN
C. SAM and HPA
D. CRH and ACTH
Answer:
SAM and HPA
Explanation:
The physiology of stress has two components. One in which is a fast response meditated by the SAM axis, and one which is a slow response meditated by the HPA axis.
What is the fundamental branch of Science from which Neuroscience stems, Biology, Mathematics, or Physics?
Answer:
Mathematics is the branch of science, which deals with numbers, involves calculations and mainly focuses on the study of quantity, shapes, measurements etc.
All options below explain why invertebrates reproduce more fertilize eggs than needed EXCEPT that
To make sure that other animals have a food source.
Many of the eggs will not survive and hatch due to predators.
This ensures that many of the eggs will have a chance to reach its adult stage
The more eggs produced the higher the chance more will survive