Mountain glaciers:

a. are also called moraines
b. melt on the mountain where they were formed
c. travel between ridges and valleys
d. break off into large floating pieces called icebergs

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?

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.

24. how are vaccines used to keep people healthy?