Rocks and dirt, remember even if it died it still counts as binary.
Answer:
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Explanation: The potential soil erosion increases if the soil has no or very little vegetative cover of plants/grass and/or crop residues. Plant and residue cover protects the soil from rain impact and splashes from it. It tends to slow down the movement of runoff water and allows excess surface water to infiltrate.
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B, the others are not testable under lab conditions.
