Phosphorus isn't as abundant as nitrogen or carbon because it is contained in the
+ and
released with
processes, which can take a long time.

The image shows embryos of three vertebrate classes

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

Match each symbol with its description.