5. Fossil records provide very few clues about the evolution of cells. In the 1960's, a Scientist named Lynn Margulis proposed The Endosymbiotic Theory. There is a good amount of evidence that supports this theory. What is
stated by the theory?

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