Birds are one of two groups of flying vertebrates (bats are the other) . Their adaptations for flight include:
A) hollow bones.
B) heavy jaws.
C) a method of breathing that extracts a majority of the oxygen from each breath of air.
D) efficient kidneys that remove metabolic wastes more quickly than is the case in other vertebrates.
E) None of the answer options is correct.
Correct Answer:
Verified
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A)relatively
A)well-developed
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