Mammals are divided into three major groups based on:

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the ability to produce milk.

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where early development of the young occurs.

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the presence of hair.

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teeth are mainly molars.

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the presence or absence of a four (4) chambered heart.

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the presence or absence of a single closed circulatory system.

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teeth are mainly incisors.

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the presence or absence of a three (3) chambered heart.

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the presence or absence of a double closed circulatory system.

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the presence or absence of a pouch.

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