What best describes a characteristic of suspensions in pesticide formulations?

A characteristic of suspensions in pesticide formulations is that they must be agitated to ensure uniform distribution. Suspensions consist of solid particles dispersed in a liquid medium, and over time, these solid particles can settle at the bottom of the container due to gravity. Agitation is necessary to redisperse the particles in the liquid, ensuring that the pesticide maintains a consistent concentration throughout the application. This uniform distribution is crucial for effectiveness, as it helps deliver the correct amount of active ingredient to the target area.

Other characteristics may involve aspects like their physical appearance or the percentage of active ingredients, but these don't capture the essential requirement for agitation as effectively as the correct choice does.