All of the above are important in promoting species richness in tropical areas.
Each of the factors listed contributes to the high biodiversity found in tropical regions:
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Time: Tropical areas have been stable over long periods of evolutionary time, allowing for more species to evolve and persist.
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Climate: The aseasonal climate in tropical regions creates favorable conditions for a wider variety of species to thrive year-round.
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High Productivity: The long growing season in tropics leads to high primary productivity, supporting diverse food webs and habitats.
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Size: The vast geographic span of tropical areas provides diverse habitats and opportunities for speciation.
Therefore, all of these factors together contribute to the rich biodiversity found in tropical regions.