The top layer of soil has the highest concentration of nutrients needed for plant growth. This is because _____.

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nutrients diffuse from the lower layers of soil toward the top layers of soil

the nutrients are released from plant roots into the top layers of soil

animal and plant wastes are decayed through the action of microorganisms to produce nutrient-rich organic matter known as humus

All of the listed responses are correct.

 

asked Dec 31, 2012 in Biology by anonymous
    

1 Answer

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animal and plant wastes are decayed through the action of microorganisms to produce nutrient-rich organic matter known as humus

 

answered Dec 31, 2012 by Ytwsa ~Expert~ (1,092 points)

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