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study of the geographical distribution of plants and animals.
a hormone that causes the secretion of gastric juices into the stomach.
cells that are formed during secondary growth by the vascular cambium ring just to the outside...
informal, local knowledge that has been built up over the centuries by the people who live in a...
a medical condition in which the body is unable to use its own insulin effectively.
series of interlinked food chains by which energy circulates within an ecosystem.