Explain the role of plants in water, oxygen, nitrogen, and carbon cycles.

Contrast how pollination is different among gymnosperms and angiosperms.

Where substance is produced during cellular respiration

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