Which two (2) of the following are trlie statements about the Turtle-Headed Sea Snakes? A
There are no variations among the snakes.
B
The snakes are all members of the same species.
С
The snakes in the area are going extinct.
D
The snakes are all members of the same population.

the answer to you question is   jet streams

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.