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← GeographyWhich change accelerates topsoil development during primary succession?
A)Increased sediment grain size sorting
B)Greater subsurface bioturbation activity✓
C)Decreased mineral cation concentration
D)Expanded aeolian dust accumulation
💡 Explanation
Greater bioturbation increases soil porosity, because animals mix organic matter throughout immature substrates via tunneling. Developing topsoil is sped up; therefore bioturbation boosts soil generation, rather than processes such as sediment sorting affecting existing soils.
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