Final answer:
Spatial homogeneity does not contribute to the species diversity of the tropics.
Step-by-step explanation:
The factor that does not contribute to the species diversity of the tropics is c) Spatial homogeneity. Spatial homogeneity refers to a lack of spatial variation or diversity in the environment. In contrast, the tropics are known for their high spatial heterogeneity, meaning there is a wide variety of habitats and ecological niches available, which promotes speciation and increases species diversity. Predation, predictability, and high productivity are all factors that contribute to the species diversity of the tropics.