Answer:
plants, weathering is base on how much tree we have on earth. tress in particular they distribute oxygen and greenhouse effect ... if a planet has lack of oxygen or not oxygenated the ozone layer will be destrupted and be unlivable. the example of a effect when having lack of plants is climate change ... the weather changes on some country because of carbon dioxide and gasoline usage that uses car that produce toxic smokes. so yea the plant is the one factor beside human that makes sense
