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.

Biology & Microbiology

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Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology