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Question

The spindle-shaped body of birds help in flight by:
  1. increasing the bird's body weight
  2. increasing the air resistance while flying
  3. decreasing the air resistance while flying
  4. reducing the bird's body weight


Solution

The correct option is C decreasing the air resistance while flying
The spindle-shaped body of birds help in flight by minimising the air resistance while flying. Other adaptations which help birds in flight are:

  Hollow bones
  Feather covered body
  Light body weight
  Modification of forelimbs into wings

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