Mammals are endothermic amniotes that possess mammary glands and hair (fur) Mammary glands – produce milk (females only) for offspring Hair – made out of the protein keratin ; helps maintain endothermy There are three groups of mammals
While most mammals give birth to young, the monotremes are egg-laying mammals
Marsupials – pouched mammals that give birth to undeveloped embryos that then develop inside a pouch
Placental mammals – embryo develops inside the mother’s uterus where an organ called the placenta provides the embryo with nutrients and oxygen and removes waste products
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