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The number of distinct layers in the described soil profile is:

A4
B3
C5
D6
Answer & Solution
Correct answer: A. 4
1. The layers are lettered from the surface down. 2. O, A, B and C horizons are named. 3. So there are 4 layers. _Source: OpenStax Biology 2e, Chapter 31, Soil and Plant Nutrition._
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