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animals that live socially or in colonies and perform certain tasks for the good of the colony as a whole.
large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
a social structure in which different classes are determined by heredity.