Which of the following functions does active transport perform in a cell? equalizing the concentration of water inside and outside a cell
Moves substances through a protein without energy
O moving substances against a concentration gradient
O Moves gases through the membrane with a concentration gradient

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