Someone help me with both of these pleaseee:((

Clavical

Muscular and Integumentary

Explanation:

I had to make a skeleton for a school project. Weird I know

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.

trachea, alveoli, lung capillaries, arteries