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- NARIS: External opening of the nasal
- passage. Plural is nares.
-
- NATURAL SELECTION: The primary
- mechanism of Charles Darwin's Theory
- of Evolution. It is a natural process in
- which the environment operates on the
- variation within the gene pool of a
- population, and selects certain
- individuals for survival because of
- differences in longevity and rate of
- production of viable offspring.
-
- NICHE: The role of an organism in its
- environment as the two interact.