Atoms of carbon are: (a) constantly being created.
(b) constantly being destroyed.
(c) continuously recycled.
(d) transported to Earth by the sun’s rays.

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