Oyster fishermen used to capture and cut up starfish to try and rid themselves
of them. Why was this a bad idea?

This is possibly a bad idea because it could mess up the balance of the oceanic ecosystem and because of the drop in starfish, the whole food chain could get affected and plants and animals could die.

hope this helped

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.