List two natural predators commonly used in biological pest control.

The use of lady beetles and lacewings in biological pest control is well established. Lady beetles, often referred to as ladybugs, are known for their appetite for aphids and other soft-bodied insects, making them effective allies in managing pest populations in crops and gardens. Lacewings, particularly their larvae, are also voracious predators of soft-bodied pests, including aphids, thrips, and mealybugs. By introducing these natural enemies into the environment, pest populations can be controlled in a sustainable manner without the need for chemical pesticides, promoting a healthier ecosystem.

In contrast, the other options mention animals that are not commonly employed or effective as biological pest control agents in agricultural or garden settings. Cats and dogs can help with certain pest issues, but they are not reliable for biological control in the same way as lady beetles and lacewings. Spiders are general predators and can control insect populations, but they lack the targeted efficiency of the other two predators. Snakes and owls might manage certain pests, such as rodents, but their role is outside the realm of traditional pest control for insects.