Which sentence is correct? (ONLY 1 IS CORRECT) A. Humans continue to evolve, but other animals have stopped evolving.

B. A theory is like an educated guess.

C. Evolution is one of many theories that explain changes in human physiology, anatomy, and behavior over time.

D. Evolution most often takes a very long time.

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

What is the problem in this article? what solution does the article propose?

What is the most abundant vertebrate on earth?