“Waste” is a subjective term. In this case, it’s the byproduct of animal metabolism. But the byproducts of animal metabolism are essential nutrients for plants. The reason this works out is down to evolution. A plant isn’t going to survive if it doesn’t have the way to obtain its nutrition. Therefore, the plants that survived are the ones that’s nutritional requirements exist in soil. Since soil is a combination of biodegraded materials including feces, the plants that survive are the ones able to use those ingredients for their metabolism.
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