What is the basic unit of matter? atom molecule gas compound

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

I’m stuck on this question cuz i’m stupid sksksksk

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