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RideAnS [48]
2 years ago
13

5. The mechanism for evolution is natural selection. Traits become more or less

Biology
1 answer:
Svetllana [295]2 years ago
4 0

Answer: A

Explanation: the ice age posed a new chalenge to deer mice and on the ice the preadators could spot the darker deer mice better than the light deer mice.

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cluponka [151]
<h2>Answer:</h2><h3>1. four</h3>

Your heart has four separate chambers that pump blood, two on the right side and two on the left.

2. When the ventricle relaxes, the aortic valve closes <em>to prevent blood from flowing back into the ventricle</em>. When the aortic valve is not working properly, it can interfere with blood flow and cause the heart to strain to send blood to the rest of the body.

3. In medicine, a person's pulse is a pressure wave caused by the expansion of the arteries as a result of the circulation of blood pumped by the heart.

4. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them.

<em>hope</em><em> </em><em>this</em><em> </em><em>help</em><em>!</em><em> </em><em>^</em><em>^</em>

3 0
2 years ago
Complete the Punnett square below by showing the genetic makeup of the parent plats of the cross shown.Be sure to show both gene
aksik [14]

Answer:

The correct answer is -

Parent 1: RW, Parent 2: RR

Explanation:

In the given punnet square there are four offspring and it is a monohybrid cross between parent 1 and parent 2. The four offspring produced in this cross have RR, RR, RW, and RW alleles. By the genotype of the offsprings, it is clear that there are 50 percent pure or true-bred and 50 percent are heterozygous.

Each parent contribute two alleles and these alleles are independently assort in the zygote to form offspring so there must be R, R, R and W allele present in the parent

Parent 2  →       R     R

Parent 1 ↓     R  RR   RR  (one allele (R) come from each parent in zygote)

                    W  RW  RW (one allele  (R and W) come from each parent)

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