Pre-emergent and fertilizer work well together because both need to be watered into the soil to be effective. By applying both at once and watering them in, you simultaneously feed your grass and stop weed seeds from sprouting.
Scientific theories are the best model, the model that best fits the truth but they are not the absolute truth. They can be discarded if proven wrong or improved if new information is found.
The correct answer is: a. New theories are always the absolute truth.
