Closure of the tricuspid valve:____.
I. Would prevent blood from flowing into the pulmonary trunk.
II. Contributes to the first heart sound (lub).
III. Occurs at the beginning of isovolumetric contraction of the ventricle.
IV. Occurs immediately before the left atrium contracts.
Answer:
The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.
Explanation:
2. List and describe two characteristics that distinguish primates from other mammals.
The two characteristics that distinguish primates from mammals are specialized behavior and unspecialized structure.
Primates are characterized by opposable thumbs, forward-facing eyes, and a low sense of smell. Primates have opposable thumbs because they adapted to tree living. All common ancestors of primates have opposable thumbs.
Primates have larger brains (in proportion to their body weight) than other mammals. They also rely more on visual perception at the cost of olfactory perception (which is the primary sense of smell in most mammals).
These characteristics are more prominent in monkeys, and much less so in Loris and Lemurs.
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What evidence do scientists have to support the big bang theory as
the origin of the universe?
Answer:Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.
Explanation:
Answer:
the earliest and most direct observational evidence of the validity of the theory are thee expansion of universe
Explanation:
Amanda has a genotype Bb and a phenotype of brown eyes. Her husband, Nick, has a genotype bb and a phenotype of blue eyes. What is the percentage of probability that their children will have brown eyes
Answer:
The percentage of probability that their children will have brown eyes is 25%.
Explanation:
Compare and contrast a fossil with a trace fossil. hlep please 13 points
Answer:
see below:
Explanation:
a fossil is usually the animal/insect/whatever, whereas the trace fossil is something like a footprint or excrament! ^.^
The number of eggs produced in internal fertilisation is
A. more than external fertilization
B. less than external fertilization
C. more or less than external fertilisation depending on the environmental conditions
D. equal to external fertilisation
Answer:
Less than external fertilizationExplanation:
The number of eggs produced in internal fertilisation is less than external fertilization .The graph shows carrying capacity in two different areas for two populations
of salmon. Which statement below is most likely true about these areas?
A. Changes in the aquatic environment in Area A has made it less hospitable to salmon
B. More food resources are available for salmon in Area B than in Area A.
C. Salmon fishing occurs in Area B but not in Area A.
D. More species compete with salmon for food in Area A than 1 Area
B.
Answer:
C ,salmon fishing occurs in area b but not in area a
The statement which is most likely true about these areas is that the salmon fishing occurs in the area B but not in the area A. Thus, the correct option will be C.
What is Carrying capacity?Carrying capacity can be defined as the species' average population size which can stay in a particular environmental habitat. The species population size in an atmosphere is limited by the environmental factors such as adequate food, shelter, water, and the mates as well. If these needs are not met correctly with the surrounding, then the population will decrease until the resource rebounds and then the species number is restored.
From the given graph which is showing carrying capacity in two different areas of two populations of salmon fishes. The statement which is most likely to be true about these areas is that salmon fishing occurs in the areas B but not in area A.
Therefore, the correct option will be C.
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help with this one pls
Which of the following terms is NOT used to refer to white blood cells? A. T Cell B. Phagocyte C. Platelet D. B Cell Please select the best answer from the choices provided. A B C D.
Answer:
the correct answer is B phagocyte
Explanation:
hope this helps.
Answer:
C
Explanation:
Platelet is something else
What catastrophic event sets a tsunami in motion? earthquake, tornado, forest fire, hurricane.
Answer: The correct answer out of these choices is an earthquake.
Hope this helps!
Answer:
Earthquake
Explanation:
I just took the test and it is correct
Keratinization:_____.
a. in the formation of new epidermal cells.
b. occurs in the dermis. produces a layer of cells that resist abrasion.
c. does not affect permeability characteristics of the epidermis.
d. determines skin color.
What is one reason why many mutations may be deleterious?.
Answer:
Mutations could affect our bodies and harm them badly. For instance, cancer is a form of cells mutating which harms the body. This could be fatal, because if the cells are mutated, they now gain new functions that they are not supposed to do, which causes the other cells to attempt fighting back.
I hope this helps! Have an awesome day.
Which two factors could increase the carrying capacity of an ecosystem?
an increase in available water and space
a decrease in food supply and predation
an increase in immigration and birth rate
a decrease in habitat size and death rate
Answer:
the answer is A decrease in food supply and prediation.
Sickle cell anemia is an inherited form of anemia — a condition
in which there aren't enough healthy red blood cells to carry
adequate oxygen throughout your body.
Normally, your red blood cells are flexible and round, moving
easily through your blood vessels. In sickle cell anemia, the red
blood cells become rigid and sticky and are shaped like sickles
or crescent moons. These irregularly shaped cells can get stuck
in small blood vessels. How does sickle cell anemia affect the
blood flow in a human? SC. 912. L. 14. 36
It can speed up blood flow of oxygen to parts of the
O body causing lower blood pressure, lower resistance
and lower blood viscosity
It can slow the blood flow of oxygen to parts of the
O body causing higher blood pressure, lower resistance.
and higher blood viscosity
It can speed up blood flow of oxygen to parts of the
O body causing higher blood pressure, higher resistance
and higher blood viscosity
It can slow or block blood flow and oxygen to parts of
o the body causing higher blood pressure, higher
resistance and higher blood viscosity
Answer: Last option
Explanation: The sickle shaped cells are less efficient at carrying oxygen. They can cause partial blockages in the blood vessels increasing resistance and thus raising blood pressure.
Help asap giving brainliest
Which of the following statements is FALSE?
Most organisms on Earth are multi-celled.
Growing children’s cells are constantly dividing.
Some cells can be shaped like a ball.
The microscopic size of cells enable them to function properly.
Answer:
This is incorrect, The microscopic size of cells enable them to function properly
the organizational stage where organisms begin to interact with other organisms
Question 1 options:
community
biome
population
Answer:
community
Explanation:
A community of organisms involves regualr interacting between different or the same species. They live, eat etc togther and display togtherness. Think of an actual functional community; working togther.
Answer:
Community
Explanation:
Actually first and last option are correlated to each other
Organisms live in community and they interact with each otherAlso they reproduce themselves while staying in communityWhich helps in increasing population of themOver the course of hominid evolution, jaw size has
Group of answer choices
increased.
decreased then increased.
decreased.
remained the same.
What annoys my mom or dad the most?
When is the best time for me to avoid lines at my favorite store?
What is the most popular color among my friends?
Perform your experiment on the topic you chose, and write a detailed account, listing all of your steps (following the scientific method), and all of your findings. Make sure to describe whether or not you were able to accept or reject your original hypothesis.
Answer:
This has to be from Ur perspective to get a good grade on this assignment so only u can do this
Explanation:
In the space provided, explain the adaptations of the plant or animal for surviving in a water
environment.
The plants living in water is also called as hydrophytes or macrophytes. The adaptations of aquatic plants are floating plants and dissected leaves. The adaptations of aquatic animals are respiration through gills, locomotion through fins and tail, and streamlined body for better swimming.
And as for aquatic animals, some of the adaptations of aquatic animals are: Their body is streamlined and hence, they can swim easily. They have gills as the respiratory organs. They have fins as the locomotory organs, Various types of fins are present in fishes such as dorsal fins, pectoral fins, caudal fins etc.
What idea did colleen cavanaugh discover through her research on deep-sea food webs?.
Colleen Cavanaugh discovery through her research on deep-sea food webs was the symbiotic role that bacteria play in chemosynthesis.
What is Symbiosis?This is defined as the relationship between two different biological organisms in an ecosystem.
The symbiotic bacteria found inside the tubeworm uses hydrogen sulfide from the vents as an energy source for themselves and the worms which depicts a symbiotic relationship and was discovered by her.
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Which is the only Kingdom in which all members have the property of motility?
A: Plant
B: Eubacteria
C: Animal
D: Fungi
Answer:
I am sure it is Eubacteria.
how do you account for the fact that e. coli can replicate faster than two replication forks can separate the strands of DNA in the circular chromosoe
Answer:
Explanation:
By theta mode of replication, an E Coli can replicate its genome in 40 minutes. But the cell division takes 20 minutes. Let us just remind ourselves how an E coli replicates its DNA. The replication always begins at the origin of replication.
What specifically separates during anaphase of mitosis?.
Given what we know, we can confirm that during the anaphase of mitosis. the sister chromatids are separated.
What is mitosis?Mitosis is a process by which cells multiply. Mitosis consists of many stages, such as:
prophaseprometaphasemetaphaseanaphasetelophase.Each of these stages has very specific processes that take place. During anaphase, the sister chromatids are separated at their centromeres, and the cell is finally ready to divide in the telophase.
Therefore, we can confirm that during the anaphase of mitosis. the sister chromatids are separated.'
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Why is the lion more related to the hamster than the hamster is related to the salamander
Answer:
The lion and the hamster differ by one trait on the cladogram, carnivore teeth. The hamster and the salamander differ by two traits. These two traits' difference shows that they are separated by a great distance.
Is is a red eared slider a producer or consumer?
Answer:
consumer
Explanation:
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Is is a red eared slider a producer or consumer
꧁༒Answer༒꧂A consumer
K12
Acid rain has worn away some features on this statue. What type of weathering is this?
erosion
mechanical/physical weathering
deposition
chemical weathering
Help please
This type of weathering is called chemical weathering.
What is chemical weathering?Chemical weathering is a type of weathering that occurs when chemical reactions break down and alter the structure of rocks and minerals. This can happen through processes such as oxidation, hydrolysis, and acid-base reactions.
Chemical weathering can be caused by various factors, including water, air, and temperature. For example, when rainwater containing carbon dioxide dissolves in the soil, it forms carbonic acid, which can chemically break down rocks. Chemical weathering can also lead to soil formation and the release of nutrients that are important for plant growth. Over time, this process can change the appearance and composition of the landscape, affecting not only the geology but also the ecology of the area.
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What is the difference between vitamin d and vitamin d3.
Answer:
Vitamin d comes from mainly plants, but vitamin d3 comes from animal resources. Vitamin d3 is made when sunlight strikes the skin.
Why is the carbon cycle important to us
Answer: The carbon cycle is important to us because it refreshes carbon in the air and helps plants grow
Explanation: The carbon cycle is important in ecosystems because it moves carbon, a life-sustaining element, from the atmosphere and oceans into organisms and back again to the atmosphere and oceans.
What do we call viral DNA that fuses with host DNA?
A) dormant
B) provirus
C) latent
D) enzyme
Answer:
Answer is Provirus
Explanation:
trust me
In general, what is the major difference in outcome when a plant cell and an animal cell are placed in hypotonic solutions.
Answer:
As a result, it also has a higher concentration of water than the cell does. Osmosis draws water out of the solution and into the cells. As a result, plant and animal cells both appear more plump when placed in a hypotonic solution. When viewed under a microscope, the vacuoles of plant cells appear noticeably larger.