What do mammals like tigers and zebras need energy for? Options:

A. Running

B. Breathing

C. Digesting food

D. All of above

d. all of the above

Explanation:

tigers and zebras both have activities that they're limited to by each species. But both of them do all that was listed, and running, breathing and digesting all take the body's energy to do.

D

Explanation:

they both need the energy to do that

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.