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What characteristics are used to classify mammals into each of their groups?
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What characteristics are used to
classify mammals into each of their groups?

User Murtuza Z
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The main difference between mammals and other vertebrates are three characteristics: hair, milk production in mammary glands, and three bones in the inner ear. Extant mammals are divided into three subclasses based on reproductive techniques
User Dessalines
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Answer:

The way they feed

The way they develop

User Xvtk
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