The statement that most supports the idea that aquaponics helps reduce the impact of human activities on the environment is: "reuse of fish water reduces the use of fertilizers."
This statement highlights one of the key benefits of aquaponics, which is its ability to combine fish farming (aquaculture) with plant cultivation (hydroponics) in a closed-loop system. In this system, fish waste provides an organic nutrient source for the plants, allowing for the reduction or elimination of synthetic fertilizers, thereby minimizing the environmental impact associated with traditional agriculture.