Which of the following is not a characteristic of all birds?
Pneumotaxic bones
Lungs with air sacs
Exothermic body
Amniotic eggs
A
Exothermic body
B
Lungs with air sacs
C
Amniotic eggs
D
Pneumotaxic bones
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Solution
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Flying
in birds is made possible due to a combination of anatomical structures and
arrangements. The presence of keel is one of the major contributors to the flying
ability of birds. Birds that lack a keel are often flightless. They all have an
outer covering of feathers, two legs and are warm-blooded.
So, the correct answer is 'They can fly'.
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