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| the seas and atmosphere on earth before the existence of life, primarily containing a mixture of water, hydrogen, methane, ammonia, and carbon dioxide |
| natural selection that favors altruistic behavior toward close relatives resulting in an increase in the individual's genetic contribution to the gene pool |
conjugant con·ju·gant (kŏn'jə-gənt)
n.
Either of a pair of organisms, cells, or gametes undergoing conjugation.