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(D) The most defining and universal characteristics of the class $Mammalia$ are the presence of mammary glands (for nourishing young ones) and interna

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Mammary glands and internal fertilization

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(D) The most defining and universal characteristics of the class $Mammalia$ are the presence of mammary glands (for nourishing young ones) and internal fertilization. While most mammals are viviparous and possess hair,there are exceptions (e.g.,$Ornithorhynchus$ or platypus is oviparous). Therefore,mammary glands and internal fertilization are the features found without exception in all mammals.

Which pair of characters are found without exception in all mammals?

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