What do you eat? What do you drink? What do you breathe? Which animals and plants do you eat? How do they grow? Where does the matter and energy come from that sustains them? Where does the water that you drink come from? What was that water part of before you drank it? Where was it before that? Where does the air come from that you breathe? How was it made? Who or what exhaled it? What inhales your exhalation?

What happens to animal and plant “waste” and dead? What would happen if humans disappeared from Earth? What would happen if decomposers disappeared from Earth?

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