How can you define such terms as overgrazing and taxonomy?

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Overgrazing is the intensive animal consumption of plants, which extracts an unsustainable yield of floral biomass from an ecosystem, typically over an extended period and without a sufficient recovery period. Overgrazing is most commonly caused by a high density of animals such as cattle, sheep, and goats on an area of land with the lack of rotation to other areas and grazing at an inappropriate time in the relation of the land to recover. Overgrazing also causes soil erosion, reduces the usefulness, productivity and biodiversity of the land...
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