In marine birds, excess salts are removed by:
a. salt glands in the tongue.
b. salt glands above the eyes.
c. concentrated urine.
d. salt glands on the skin.
e. salt glands in the mouth.
B
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Which fossil is the earliest known bird with a beak? a. All of these had beaks
b. Sinosauropteryx c. None of these had a beak. d. Confuciusornis e. Archaeopteryx
Genes are composed of
a. DNA. b. proteins. c. chromosomes. d. carbohydrates. e. lipids.
The breakdown of large molecules by the enzymatic
addition of water is what kind of reaction? a. oxidation b. reduction c. condensation d. hydrolysis e. decarboxylation
Endothermic animals
a. use up more energy than ectotherms. b. have more stamina than ectotherms. c. have a higher metabolic rate than ectotherms. d. may have layers of fat to reduce heat loss. e. fit all of these descriptions.