Question

how did gmos reduce the use of pesticides in some cases? by making crops healthier for pests by making crops resistant to insects by eliminating all pests entirely

Explanation:

Genetically - Modified Organisms (GMOs) can have genes inserted that code for proteins toxic to pests or make the crops less palatable to them, thus making crops resistant to insects and reducing the need for pesticides. Making crops healthier for pests would increase pesticide use, and eliminating all pests entirely is not possible.

Answer:

by making crops resistant to insects