Which of the following processes takes place during prophase?
a. mitotic spindles form.
b. nuclear membranes form around two sets of chromosomes.
c. chromosomes are copied
d. spindle fibers pull the sister chromatids apart

A) Mitotic spindles form

Explanation:

The mitotic spindle begins to develop during prophase. As the cell's two centrosomes move toward opposite poles, microtubules gradually assemble between them,

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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