What is the most unique mammalian characteristic?

What is the most unique mammalian characteristic?
  1. Presence of milk producing glands (mammary glands)
  2. Two pairs of limbs
  3. External ears or pinnae
  4. Four-chambered heart

Solution

The presence of milk producing glands (mammary glands) is the most unique characteristic of mammals, as it allows for the nourishment of young ones.

Asked in: NCERT

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