What is the unique characteristic of animals classed as monotremes, which represent a surviving link between mammals and reptiles?
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Echidna is a genus in the subclass monotremes. Scientists think of monotremes as roughly corresponding to a link between mammals and reptiles. Monotremes is a subclass within the class of mammals. All monotremes have glands (sweat glands?) that provide milk, are warmblooded, and have a four chambered heart.
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