Topic: Chordates up to classes· Diversity in Living World

The unique mammalian characteristics are:

1. pinna, monocondylic skull and mammary glands

2. hairs, tympanic membrane and mammary glands

3. hairs, pinna and mammary glands

4. hairs, pinna and indirect development

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

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Answer: 3. hairs, pinna and mammary glands

Key idea: Hairs, external ear (pinna) and mammary glands are unique mammalian features.

A monocondylic skull belongs to birds and reptiles, since mammals have a dicondylic skull. The tympanic membrane is also found in frogs and others. Indirect development is not typical of mammals. Option 3.

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

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The unique mammalian characteristics are:

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