How evolution occurs in terms of natural selection

Over a long period of time the process of natural selection continues, a gradual change in the characteristics of a population by which members becomes better adapted for the environment in which they live. This is evolution by natural selection.

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.