A common herbicide can kill nearly all kinds of plants. Farmers want to use the herbicide to lower the number of harmful weeds growing near their crops. What technique will newly planted crops need for the herbicide to be most effective?
They will need to be sprayed with the herbicide to kill insects that eat the crops.
They will need to be genetically engineered to be resistant to the herbicide.
They will need to be given extra fertilizer to reverse the effects of having less weeds because of the herbicide.
They will need to be treated with the herbicide when still young so that only the strongest crops survive and grow.