Early human embryos have gill slits and tails. This is evidence that Your
O humans used to be fish
O
we share a common ancestor with many animals
fish and humans have analogous structures
all of the above

i think the best answer out of those choices is that we share a common ancestor with many animals

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.

the correct answer to this question is #5