Aquatic Animals Such as Fish and Frogs Are Especially Good

Aquatic animals such as fish and frogs are especially good indicators of pollution because _____________.

A) both kinds of animals are vertebrates, and the metabolism of these organisms is most like ours
B) most chemicals are water- soluble and thus can easily enter these organisms
C) all chemical toxicants are found in water
D) they are easy to catch
E) these organisms are the most abundant on earth