What soil horizon is the most important for the growth of plants (agriculture) ?

Explanation:

The O horizon is typically at the top of the soil structure and is made up of mostly organic matter. This organic matter is vital to the growth of crops and other plants because it holds nutrients such as carbon, phosphorus, nitrogen and sulfur.

b exhibiting favoritism toward the kikuyu people.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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