How does learning about animal structure, fossil records, and DNA sequencing from species that no longer exist help us care for the species that exist today? Write a paragraph answering this question. Include the following terms in your homology, common ancestor, and embryonic development.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.