One function of tilling is to turn over weeds that compete with crops. Thus, a potential unintended consequence of no-till agriculture is an increased need for .

herbicides

Explanation:

I don't know what options were given but try herbicides or chemical weed-killers or chemicals or something along that line.

the graph shows the price of a good compared to the quantity supplied.

this graph demonstrates how

    [d]:   " the amount consumed greatly changes with the price. "

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