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Native fish
- fish natural to waterbody and area they are found in; not an introduced species
Natural selection
- theory of evolution as proposed by Charles Darwin; the idea that only the fittest of organisms, the ones possessing the characteristics that allow them to survive and pass to their offspring the genes necessary for survival, survive. In other words, the ones best adapted to their environment.
Non-biodegradable
- substance that do not break-down or be recycled by natural process
Nutrient
- a substance required by the body for energy, growth, repair, or maintenance
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