Correct option is D. There are more species in tropical areas than in places more distant from the equator. This is probably a result of  a longer time frame without disturbances for evolution and speciation
- Tropical latitudes have higher levels of production and biodiversity because they get more solar energy than temperate regions.
- Tropical areas have a more or less steady climate with fewer seasonal variations. This promotes specialty specialization and, as a result, the high animal richness.
- Tropical regions were unaffected throughout the ice age, whilst temperate regions were more susceptible to glaciations. This difference helped the region's biological variety increase.
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