Explain how different specialized limb structures can arise from basic pentadactyl
structure.

What are genotypes? what are phenotypes?

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

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line