Which mammalian feature distinguishes them from all other vertebrate classes?

Type: MCQ • Marks: 1

A. Breathing via gills

B. Presence of a backbone

C. Presence of mammary glands for milk production, hair, and external ears (pinnae)

D. Laying eggs

Explanation

Mammals are warm-blooded vertebrates bearing hair and nourishing young with milk.

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Class 9th Science (MCQ)

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