Which of the following animals...?

Question

are likely to lack respiratory pigments?

A. mammal in an Amazon jungle

B. fish in a shallow pool in a sunny meadow in Texas

C. bird in north Alaska

D. frog in a pond in North Dakota

E. fish in the Antarctic Ocean

Answer 1

A respiratory pigment is a molecule, such as hemoglobin in humans, that increases the oxygen-carrying capacity of the blood. The four most common invertebrate respiratory pigments are hemoglobin, haemocyanin, haemerythrin and chlorocruorin.

Many cold-blooded animals found in polar seas lack respiratory pigments because of the high oxygen solubility in icy-cold body fluids.

Therefore, the best answer is:

E. fish in the Antarctic Ocean