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KATRIN_1 [288]
3 years ago
14

What is the function of heart valves?

Biology
2 answers:
tatyana61 [14]3 years ago
6 0

Answer:

C.

Explanation:

yuradex [85]3 years ago
3 0
The valves prevent the backward flow of blood.
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What is natural selection? How does this work on organisms in nature? (should be at least 3 sentences)
BigorU [14]

Answer:

The natural selection is a theory made by Charles Darwin where animals better adapted to their environment tend to survive and produce offspring. for example, there are about 50% of beetle that are green and 50% orange.  If crows tend to eat green beetles more, there will be more orange beetle to produce offspring so there wood then be less green beetles to be eaten by crows.

An environment can change over time and this will cause for the animals living in the environment to adapt as well. These changes will occur when an animal with undesirable traits don't survive to reproduce. The offspring of individuals that do survive to reproduce will inherit their parent's desirable traits. Over many generations, the desirable traits will be seen in more-and sometimes all- of the individuals in the population

Explanation:

That is the natural selection told in my words, but please do your best to rewrite your own sentence/paragraph. Copying another's work is called plagiarism and any teacher can automatically give you a 0% for this.

Anyway, goodluck.

<em>Please mark as Brainliest and feel free to ask for any more information.</em>

<em>                                                       ~~~They Speak To Me~~~                                                            </em>

4 0
3 years ago
How is carbon dioxide fixed into carbon that is usable for biological life?
slava [35]
The most prominent example of carbon fixation is photosynthesis
4 0
3 years ago
Comparing Microscopes
amm1812

Answer:

C

Explanation:

The crayfish is a relatively large specimen, even the mouthparts. Since you are dissecting the mouthparts, you need a 3D view: you should use the dissecting microscope.

4 0
3 years ago
Which organism has the most energy available?
svetlana [45]

Answer:

B.Plants

Explanation:

They are considered as autotrophs because they manufacture their own food and have the highest amount of energy.

3 0
3 years ago
Why does the swing of a pendulum become lower over time? (site 1)
kupik [55]

When the swing is raised and released, it will move freely back and forth due to the force of gravity on it. The swing continues moving back and forth without any extra outside help until friction between the air and the swing and between the chains and the attachment points slows it down and eventually stops it.

6 0
3 years ago
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