What do the chemical reactions that occur during burning and rusting have in common? a. they are both reactions of a substance with water. b. they are both reactions of a substance with oxygen. c. they are both reactions that happen very quickly. d. they are both reactions that produce oxygen.

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.