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the immunity with which an organism is born.
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and...
animals that lack a cavity between the digestive tract and the outer body wall.
the sequence of events relating to the flow of blood or blood pressure in the heart that occurs...
cartilage with few collagen fibres and no elastin fibres. It reduces friction in joints,...