a group of mammals in Australia which give birth to incompletely developed young, and then care for them several months in an external pouch.
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mammal
a warm-blooded vertebrate covered with fur or hair, breading air with lungs and a diaphragm, having a 4 chambered heart, and the largest and most developed brai
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placenta
an organ of blood vessels that supply food and air exchange for the babies developing inside female mammals.
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diaphragm
the muscles dividing the chest cavity from the abdominal cavity.
