What is a key distinction between biological control and chemical control?

Biological control and chemical control represent two different approaches to managing pests, and the key distinction lies in the methods they employ. Biological control specifically involves the use of natural predators, parasites, or pathogens to manage pest populations. This approach leverages the existing ecosystem, promoting the natural balance between species. For instance, introducing ladybugs to control aphid populations is a common practice in biological control.

In contrast, chemical control typically involves the application of synthetic pesticides that are designed specifically to kill or repel pests. These chemicals often act quickly and can be applied directly to the crops or areas where pests are a problem. However, they do not take advantage of natural ecological relationships and can sometimes lead to adverse effects on non-target species and the environment.

Thus, the correct answer highlights this fundamental difference, showing that biological control relies on the use of natural biological processes, while chemical control depends on human-made substances.