What is the cell membrane made of? Check all that apply. proteins

cellulose

carbohydrates

lipids

Explain why the plants cortex would serve as the best food source for animals

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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