from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Natural selection conceived of as a struggle for life in which only those organisms best adapted to existing conditions are able to survive and reproduce.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Natural selection.
from the GNU version of the Collaborative International Dictionary of English
- n. See Natural selection, under Natural.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a natural process resulting in the evolution of organisms best adapted to the environment
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