Question

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Answer 1

Answer:

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Answer 2

Answer:

The bodies of birds are adapted for flying. Many of a bird's bones are less dense than human bones, which makes birds' bodies lightweight. Flying birds have large chest muscles that move the wings. ... The air sacs enable birds to extract much more oxygen from each breath of air than other animals can.

Explanation:

Instead of heavy jaws and teeth, they have lightweight beaks. And instead of fur, they have feathers. These are light, streamlined and cleverly adjustable for flight control. Their bones are also hollow (pneumatised) making them lighter for flight.