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The surface layer holding freshly decomposing organic matter is the:

AC horizon
BO horizon
CA horizon
DB horizon
Answer & Solution
Correct answer: B. O horizon
1. It sits at the very top of the profile. 2. It is built from leaf litter and humus. 3. That layer is the O horizon. _Source: OpenStax Biology 2e, Chapter 31, Soil and Plant Nutrition._
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