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| any modern theory of evolution holding that species evolve by natural selection acting on genetic variation |
| the seas and atmosphere on earth before the existence of life, primarily containing a mixture of water, hydrogen, methane, ammonia, and carbon dioxide |
| free-living | |
| —adj | |
| 1. | given to ready indulgence of the appetites |
| 2. | (of animals and plants) not parasitic; existing independently |
| free-'liver | |
| —n | |