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Answered

The usual vertical sequence of horizons in a soil from the surface downward is;

A. O, A, B, C, E, R
B. A, B, C, E, O, R
C. O, A, E, B, C, R
D. A, E, B, C, O, R

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Sagot :

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Answer:

O, A, E, B, C, R

Explanation:

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