Which of the following features is characteristic of birds but not reptiles?
Eyes
Hollow bones
Tail
Lay eggs
A
Eyes
B
Lay eggs
C
Hollow bones
D
Tail
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Solution
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With hollow bones, a bird can fly very long distances without getting worn out from carrying its own weight. Hollow bones look like other bones, with the usual hard exterior like a human bone has. But instead of being filled with marrow (as in humans), a hollow bone has an air cavity inside.
So, the correct option is A.
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