Which of the following countries is most likely to have a pyramid-shaped age structure?
a. Niger
b. The United States
c. Sweden
d. Italy
b. The United States
The United States is most likely to have a pyramid-shaped age structure because it has more older individuals than young ones.
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Which structure is derived from an ancestral air-breathing lung in ray-finned fishes and is used to increase buoyancy?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
Formation of a pseudomembrane in the back of the throat is seen in cases of ________.
A. SARS B. tuberculosis C. diphtheria D. pharyngitis E. pertussis
Integumentary exchange of gases implies that the animal ____
a. has a shell b. has a tracheal system c. lives in a moist location d. has a siphon e. lives in an arid location