Why are snails classified as a gastropod mollusks?

Snails have soft bodies and are protected by shells, which are the characteristics of gastropods mollusks.

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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