Areas with a vast amount of varied niches will invariably contain:

(1) great diversity among the organisms

(2) little diversity among the organisms

(3) no organisms that risk extinction

(4) large numbers of organisms that risk extinction

When a duck dives into cold water, the capillaries in its skin constrict and move deeper below the surface of the skin. This reaction is an example of:

(1) homeostasis

(2) synthesis

(3) respiration

(4) excretion

An organism with chitinous appendages and Malpighian tubules most likely eliminates carbon dioxide through:

(a) spiracles

(b) tentacles

(c) antennae

(d) nepbridia

The amino acids in the amino acid sequences of the polypeptide chains of human proteins differ from those of chimpanzees by approximately what percentage?

(1) 1%
(2) 8%
(3) 20%
(4) 30%
(5) 45%