Do you have a list of possible answers?
Your muscles. Some muscles are “voluntary.” They
are the ones you control, the ones that let you exercise—or
relax. Some muscles are “involuntary.” They just do their
job with no effort on your part—like your heart muscles.
Your body heats up which causes u to sweat, in which it cools u down
Answer: Estrus is a fertile stage of the female reproduction cycle
