Easy biology question below first correct answer gets brainliest

Vestigial in that sense that the organ seemingly has no functions or useless now but they might have functions previously which are lost someway due to evolution. ... The human appendix may be considered as a vestigial organ as it has been proved that the removal of the organ after infancy does not create any harm

Explanation:

oak trees? ? what was listed

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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