Explain how recycling practices can lead to environmental sustainability.

Well, recycling is our the way for us to use a material over and over again. That means that we don't need to make the same material, we can just reuse it again by taking the old one and making the new material again. So we don't need to use any human labor, fuel for trucks, or whichever things they need to get plastic, aluminum, wood for paper, etc. 

The answer your looking for is a food chain grid. it describes how nature can support itself and survival of the fittest comes into play..