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Distribution & Abundance
In any habitat a species occupies a specific niche determined by the environmental conditions (biotic and abiotic factors) and the way that the
species used the habitat (food, shelter etc.). The distribution and abundance are determined by these conditions. Changes in these
conditions therefore lead to changes…

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Grazing, predation and parasitism are all relationships between two organisms where one benefits at the other's expense.

Biotic factors are usually density dependent: the effects are related to the size of the population relative to the area available e.g. the
larger the population density, the greater the competition for food…


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