What is biological evolution?
a) the change in the gene pool of a population over time
b) the ability of an individual organism to acquire traits
c)the adjustments individual organisms make to their environment

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