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Organic organisms affect erosion by influencing soil formation processes and soil properties. They assist in the formation of humus by decomposing leaves and twigs. The decomposition into organic matter influences macro- and micro-nutrient amounts, such as of calcium, magnesium and potassium, and pH levels, such as greater acidity with broken-down spruce tree parts and lesser with decomposed oak tree roots and shoots.

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Q: How do organic organisms affect erosion?
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