Multiple choice

Which feature is common between birds and crocodiles?

  1. Presence of four chambered heart

  2. Presence of hairs

  3. Presence of oil glands

  4. Presence of beak
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A Correct answer
Explanation

Both birds and crocodiles are archosaurs that share a four-chambered heart, which is an evolutionary advancement allowing complete separation of oxygenated and deoxygenated blood. This differs from most reptiles which have three-chambered hearts with partial mixing. The four-chambered heart supports higher metabolic rates and endothermy in birds, while crocodiles retain this structure from their archosaur ancestors.

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