Question 8 of 10
2 points
why do adults have stem cells?
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a. they are left over from earlier development.
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b. they are responsible for maintenance and repair.
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c. they replace organs that are worn out.
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d. they continue the growth of the body.

B)

Explanation:

The adult stem cell can renew itself and can differentiate to yield some or all of the major specialized cell types of the tissue or organ. The primary roles of adult stem cells in a living organism are to maintain and repair the tissue in which they are found.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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