Question

Features that help the bird to maintain constant body temp
a) Digits b) Wings c) Pneumatic bones d) Feathers​

Answer 1

Answer:

Features that help the bird to maintain constant body temp d) Feathers

Explanation:

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Answer 2

Explanation:

Which of the following characters represents flight adaption of birds?

ANSWER

Pneumatic bones have air spaces within them which make them lighter than more solid bone. They are only found in the skull.

The breastbone or sternum is one of the largest bones of a bird's skeleton and is part of pectoral girdle which is used for attachment of flight muscles.

Forelimbs of birds are modified into wings that help them to fly. These wings exert a downward force that helps the birds to lift up.

All of the above are the adaptation by birds which helps them in flight. Hence, option D is correct.