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The unique mammalian characteristics are:
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hairs, pinna and mammary glands
Class: Mammalia:
- They are homoiothermous.
- The skin has hairs and glands.
- External ears or pinnae are present.
- Respiration is by lungs.
- Heart is four chambered.
- They have mammary glands by which the young ones are nourished.
- Sexes are separate and fertilisation is internal. They show direct development.
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