How does a catalyst influence a chemical reaction? A. it speeds up or slows down a chemical reaction by direct participation
B. It reacts with products to increase the concentration of reactants
C. it decreases the amount of energy necessary for the reaction to proceed
D. It increases the total amount of products formed

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.