Which of the following statements is true about atoms? -All atoms are the exact same size.
-Atoms are made of the same type of parts, but the sizes change.
-Atoms are made from different types of parts, but they are the same size.

I think the last one will be correct

Atoms are made of the same type of parts,but the sizes change

Explanation:

answer; i believe that the correct answer is (lung);

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.