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| any alteration in the structure of an organism resulting from natural selection, by which the organism becomes more able to survive in its environment |
| the colloidal and liquid substance of which cells are formed, the cytoplasm and nucleus: no longer in technical use |
mosaicism mo·sa·i·cism (mō-zā'ĭ-sĭz'əm)
n.
A condition in which tissues of genetically different types occur in the same organism.