Most of the body's heat results from a. physical exertion.
b. the surrounding environment, such as sunlight.
c. chemical reactions occurring in cells.
d. the activity of the heart.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Cedric has a low fever and minor aches. yesterday, he went to the doctor for his booster shot and receive the flu shot. which best explains why he has this reaction?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.