Active transport differs from Passive transport in that: O A. Only Active transport uses membrane proteins.
B. Passive transport requires energy.
C. Active transport requires energy.
D. Only Passive transport uses membrane proteins.

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

Ture or false evidence for evolution includes millions of fossils

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area