What distinguishes animal systemics in pesticide products?

Animal systemics in pesticide products are characterized by their ability to be absorbed by animals and subsequently distributed throughout their tissues. This property allows the pesticide to provide protection against pests that may infest or interact with the treated animal, ensuring that the entire system of the animal is capable of defending itself against these threats.

This absorption and movement within the animal's tissues enable a more systemic approach to pest management, where the pesticide does not just act on the surface but internally affects various parts of the organism. As a result, it can be effective against pests that consume, bite, or otherwise come into contact with the treated animal.

The other options describe characteristics that are not applicable to animal systemics. For instance, the notion of being effective solely on plant pests pertains to products designed specifically for agricultural purposes rather than for application on animals. Similarly, the limitation of application methods to soil or exclusive use for aquatic animals does not reflect the broader capacity and intended target range of animal systemic products. Therefore, the defining attribute of how these systemics function through absorption and distribution within animal tissues accurately identifies them within the context of pest management strategies.