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study of the geographical distribution of plants and animals.
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
small groups of cells found in the pancreas that secrete the hormones insulin and glucagon.
(also called secondary thickening) growth due to new cells being formed by the secondary...
small fluid-filled sacs that store, transport, or digest cellular products and waste.
open water near the surface of a lake, pond or ocean.