How do streams conserve biodiversity?
a. they connect habitats
b. they are confined by a bank and a bed
c. they inhibit fish migration
d. all of the above

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?