Question

what causes the pesticide treadmill? pest species evolve resistance via natural selection and more pesticide must be used on them. pesticides exercise the pests, wearing them out, causing their bodies to become stronger. pests that are not susceptible to pesticides no longer reproduce because they have more resources. the weakest pest individuals survive but die of starvation quickly after harvest.

Explanation:

The pesticide treadmill occurs when pest species develop resistance to pesticides through natural - selection. As they become resistant, more pesticide is then required to control them. The other options are incorrect as pesticides do not 'exercise' pests, pests resistant to pesticides are more likely to reproduce, and the weakest pests are usually killed by pesticides rather than surviving to die of starvation after harvest.

Answer:

Pest species evolve resistance via natural selection and more pesticide must be used on them.