Given the very high cost of purchasing herbicides, such as Monsanto (now Bayer) Corporation's Round-up, to control weeds in crop fields, you might think that farmers could just dilute the herbicides and spray a lower concentration on their fields. Farmers would be ill advised to do this because: a) diluting the herbicides is prohibited by the Monsanto Corporation b) diluted herbicides could bind to nitrogen and phosphorus from the soil c) sub-lethal concentration of herbicides could induce resistance mutations d) sub-lethal concentration of herbicides could select for herbicide resistance

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