Multiple choice

Why is the shape of birds streamlined?

  1. To minimize force of friction

  2. To increase force of friction

  3. To overcome gravitational force

  4. To protect themselves from the ill effects of sunlight
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Birds evolved streamlined bodies to minimize air resistance (friction) during flight, making movement more efficient. Increasing friction would make flight harder, while body shape is unrelated to overcoming gravity or protection from sunlight.

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