Away in which science has improved a societal problem.

a. contaminated water being purified
b. pathogens becoming resistant to antibiotics
c. bacteria contaminating food
d. unknown diseases appearing in some areas

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center