Which of the following statements is false regarding root hairs?
a. they are outgrowths of endodermal cells
c. they increase the surface area of the root
b. they are outgrowths of epidermal cells
d. they absorb water and nutrients

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?