An example of a biological control against insects is the use of:
A. pesticides.
B. herbicides.
C. sex hormones.
D. wildlife refuges.
E. All of the above are biological controls.
Attracting insects with their own sex hormones, or pheromones, and then trapping them is an example of a biological control because you use only a natural mechanism of attracting them. Pesticides are chemicals that kill insects and are not normally found in nature. Herbicides are chemicals that kill plants.