How are sea cucumbers different from other exhinoderms

They are soft bodied and their leathery skin lack spines. They also have wart type things on their body.

Explanation:

haploid cells;

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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