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From course:

Aging - CSNN

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(Practice similar questions for free)
Question:

A. 6 b. 8 c. 10 d. 12

Author: Teresa Pena


Answer:

Two hundred years ago, America's cropland had at least twenty-one inches of topsoil. For the most part, how many inches of topsoil does it have today?


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Author

Teresa Pena
Teresa Pena