All cells must have energy to function. Most of the energy used by the cells in your body is produced by cellular
respiration. In cellular respiration, cells use_ to release energy stored in.?

Cells use oxygen to release energy stored in sugars such as glucose

Explanation:

velocity and height

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.