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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

Which of the following features is common between birds and mammals?

Options

  1. APigmented skin and bony endoskeleton
  2. BPulmonary respiration and four-chambered heart
  3. CViviparity and 12 pairs of cranial nerves
  4. DHomeotherms and four-chambered heart

Correct answer

D. Homeotherms and four-chambered heart

Step-by-step solution

Birds and mammals are homeotherms. Birds are warm-blooded, which means that they can maintain their own body temperature irrespective of the surrounding. This feature is evolved in them due to the development of a 4-chambered heart.

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