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Lemur [1.5K]
2 years ago
6

Ralph is looking at a blood vessel under a microscope as part of his study about the cardiovascular system. He notices that the

vessel contains blood and has valves. What is the blood vessel that he is observing?
Biology
2 answers:
coldgirl [10]2 years ago
8 0

Answer:

Veins

Explanation:

inn [45]2 years ago
3 0

Answer:

the person is correct its VEINS

Explanation:

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mezya [45]
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A malaria outbreak causing a Lily's frequencies to change is an example of
Dima020 [189]

Answer:

A malaria outbreak causing allele frequencies to change is an example of <u><em>natural selection.</em></u>

Explanation:

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When the outbreak of malaria occurs, those organisms which do not catch malaria are able to survive and pass on their characteristics to their offsprings. the other organisms die and do not reproduce. This will cause changes in the allele frequencies.

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