Answer: Mutualism is a relationship of two organisms wherein both organisms benefit from each other. ... Commensalism is a relationship of two organisms wherein one organism benefit from the other with neither harm nor benefit to the other
I'm pretty sure it would be;
-breaking down living and dead plant material
Overconsumption – situation where resource use has outpaced the sustainable capacity of the ecosystem. ...
Overpopulation – too many people for the planet to sustain. ...
Acid rain.
Biodiversity loss.
Deforestation.
Desertification.
Global warming/climate change.
Habitat destruction.
source - wikipedia.org
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