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| single-celled colonial algae occurring in soil and on moist rocks and vegetation and also as a slime or scum on ponds and stagnant waters |
| any alteration in the structure of an organism resulting from natural selection, by which the organism becomes more able to survive in its environment |
isotype i·so·type (ī'sə-tīp')
n.
An antigenic marker that occurs in all members of a subclass of an immunoglobulin class.