Which of the following is an example of a biotic factor interacting with its ecosystem? the amount of oxygen in the air

the dry climate in a desert area

the rate of flow of water in a river

the worms in an area of soil

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