What type of circulation do crocodiles, birds, and mammals have?

What type of circulation do crocodiles, birds, and mammals have?
  1. Single circulation
  2. Incomplete double circulation
  3. Complete double circulation
  4. None of the above

Solution

Oxygenated and deoxygenated blood received by the left and right atria respectively passes on to the ventricles of the same sides, hence these animals have double circulation.

Asked in: NCERT

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