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a relationship between two different organisms, of different species, from which at least one of the organisms benefits.
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
a series of numbers that represents the types and arrangement of the teeth of a mammal.
the digestive tract of an animal, made up of different organs, that extends from the mouth to...