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| any modern theory of evolution holding that species evolve by natural selection acting on genetic variation |
| a mass of protoplasm found in most cells, directing their growth, metabolism, reproduction, and functioning in the transmission of genic characters |
structure struc·ture (strŭk'chər)
n.
The arrangement or formation of the tissues, organs, or other parts of an organism.
A tissue, an organ, or other formation made up of different but related parts.