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Class Mammalia is a diverse group of animals that are characterized by certain key features, such as hair or fur, the presence of mammary glands that produce milk, and the birth of live young in most species. Mammals are divided into several sub-classes and orders, based on their unique characteristics. Below is the classification of Class Mammalia, starting from the broadest category down to the more specific classifications: The class Mammalia is primarily divided into three main sub-classes: 1. Prototheria – This subclass contains the egg-laying mammals, also known as monotremes. The animals in this group include the platypus and echidna. These species lay eggs instead of giving birth to live young. They possess mammary glands ________ ______ _________ _________ _________ ____ ____ _____ ________ _________ _______ _______.
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