Mammary Glands - gland in mammals that produces milk to nourish the young
Subcutaneous fat - layer of fat cells beneath the skin
diaphragm - large, flat muscle at the bottom of the chest cavity that contracts during breathing, pulling the bottom of the chest cavity down and increasing its volume
Cerebral cortex - outer layer of the cerebrum of a mammal's brain' center of thinking and other complex behavior.
Monotremes - egg laying mammal
Marsupials - mammal that bears live young that complete their development in an external pouch
Placenta - organ in placental mammals through which nutrients, oxygen, carbon dioxide and wastes are exchanged between embryo and mother.
Hominoid - member of a group of primates that includes apes and humans
Homind - primate that walks upright, has opposite thumbs, and possesses a large brain, only living members are humans.
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