Island 3 and 4 are located 93 miles from the mainland have more species richness.
It will be any large island that is far from the mainland will have more endemic species and species richness than any island that is nearby the mainland.
Species richness is number of species which is found in that particular area.
As we see when there is an island which is nearby the mainland, the species from mainland may migrate and disturb the species richness of that island.
But, the far ones are not disturbed and they maintain the species richness and neither the endemic species are disturbed.
High species richness is bound to spreading of population to large areas which increases their population
External factors like migration can affect species richness.
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