In aerobic respiration, what is the direct source of energy that atp synthase uses to synthesize atp? a. an electron gradient b. an exergonic chemical reaction c. a water gradient d. a proton gradient

Asmall population of chimpanzees lives in a habitat thant undergoes no change for a long period of time. how will genetic drift affect this population

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 of these is not a nucleotide base found in dna?