Species richness goes on decreasing as we move from equator to pole.
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Explanation: Less resources available to support species. Speciation is generally a function of time and environmental stability, so if conditions are too harsh, it is difficult for the species to survive and adapt. This results in decrease in biodiversity towards the poles.
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The possible reason could be as follows: 1. Temperature decreases as we move away from the equator towards the poles. 2. The intensity of sun light decreases as we move away from the equator towards the poles and hence productivity. 3. In polar regions the temperature is very low so most of the organisms cannot survive in that habitat.
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