Topic: Chordates up to classes· Diversity in Living World

Which one of the following characteristics is not shared by birds and mammals ?

1. Ossified endoskeleton

2. Breathing using lungs

3. Viviparity

4. Warm blooded nature

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 3. Viviparity

Both birds and mammals have a bony endoskeleton, breathe with lungs and are warm blooded. Viviparity (giving birth to young) is a feature of most mammals, but birds are oviparous (egg-laying). So viviparity is not shared.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following characteristics is not shared by birds and mammals ?

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