Agricultural ecosystems that are well managed can help regulate the water and nutrient cycles. People who tend these systems need to know very well what plants are growing well, how old they are, and how they affect the other plants in the area. Farmers can positively affect the biodiversity in their ecosystem by cultivating many useful species that may not do as well without their care. Many “home gardens” in tropical areas of the world have been known to be important places for species that are otherwise going extinct.
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