Biologic weathering can result in chemical erosion primarily through the action of bacteria, as well as other organisms, that release acids and other chemical agents that break down rock. This process enhances the chemical weathering of minerals in the rocks, leading to their dissolution or alteration.
While roots can physically loosen soil and break rocks, and large herds can trample and break up soil, these actions are more related to physical weathering rather than chemical erosion. Plants transpiring water vapor does not directly contribute to chemical erosion either. Therefore, the best explanation for how biologic weathering contributes to chemical erosion is:
Bacteria release acids and other agents that break down rock.
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