Why Do The Tropics Have The Greatest Levels Of Species Richness?

The tropics show the greatest levels of species richness because of the following reasons:

Speciation: The tropics have been left undisturbed for several years that led to the evolution of several species as compared to the species in the temperate regions. 

Environment: The environment is more predictable, constant and less seasonal. This provides an opportunity to a large number of species to flourish which leads to species richness.

Solar energy: More solar energy increases productivity and in turn increases the diversity.

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