How can pesticide use be harmful to human agriculture?

Pesticide use is harmful to human agriculture because it contains an antifreezing chemical (present in transportation vehicles). When the chemical seeps into the leaves of the plant, it is distributed all over its body and remains there. The chemical may still be present there when we are going to the plant.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.