(D) The class $Mammalia$ is characterized by the presence of mammary glands (milk-producing glands) in females,which are used to nourish their young o

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(D) The class $Mammalia$ is characterized by the presence of mammary glands (milk-producing glands) in females,which are used to nourish their young ones. This is the most unique and defining feature of mammals. Other features include the presence of hair on the skin and two pairs of limbs.