(B) In the soil,decomposition primarily occurs in the upper layer (topsoil) where organic matter is abundant and microbial activity is high.In water b

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(B) In the soil,decomposition primarily occurs in the upper layer (topsoil) where organic matter is abundant and microbial activity is high.In water bodies,decomposition primarily occurs at the bottom layer (benthic zone) where dead organic matter (detritus) settles and accumulates.