Multiple choice

Which of the following is true about birds?

  1. They have three-chambered heart.

  2. They are the least diverse tetrapod vertebrates.

  3. They excrete urea and ammonia as excretory products.

  4. They have a strong beak but no teeth.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Birds lack teeth and the beak performs grinding of food into smaller particles.

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