Hummingbirds can hover because

A) They have large breast muscles that enable their wings to generate lift in the upstroke and downstroke.
B) They burn only sugar and not fat.
C) Their wings beat rapidly, often higher than 30 beats/sec.
D) A and C


Answer: D

Anatomy & Physiology

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In ruminants, heart girth and barrel make up _________________________________________

Fill in the blank(s) with correct word

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