The reason why the early centers of agriculture were primarily in the tropics was because of the abundance of rainfall.
Tropical areas such as Equatorial Rainforests, are known to have a lot of rainfall. In fact, their climate is such that rain can fall all through the year regardless of season.
As a result of this, there is an abundance of water available for farming and agriculture. This is why centers of agriculture were based in the tropics because the water could easily be used for the plants.
In conclusion, centers of agriculture were primarily in the tropics due to the abundant rainfall.
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