Which of the following factors influences the species richness of a community the most?

Question

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Speciation rate, or the rate at which new species are formed, has the most direct impact on species richness in a community. As new species are added, the overall number of species within a community increases, whereas extinction of species decreases community species richness. While factors like amount of sunlight and precipitation can influence the types of species that are present, they are not as direct of drivers for overall species richness as speciation rate. Geographic size and distance to other communities can also indirectly influence species richness by affecting immigration and emigration rates, but again, these factors are not as direct as speciation rate.

Which of the Following Factors Influences the Species Richness of a Community