Which of the following represents an appropriate hypothesis? If there is more carbon dioxide in water, then plants will grow taller. If red hair is heritable, then it will be passed down to the offspring. If a woman has a baby, then she is more likely to become hysterical. If magic exists, then the future can be predicted.

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