- (a) Insects: Many insects, such as bees and butterflies, are essential pollinators for crops and wild plants. - (b) Snakes: Snakes are often predators of rodents (like rats and mice) which are considered pests that damage crops and stored food. By controlling rodent populations, snakes help protect against damage. - (c) Frogs: Frogs are insectivores and consume large quantities of insects, including many agricultural pests. - (d) Earthworms: Earthworms play a vital role in improving soil health and fertility through aeration, drainage, and decomposition of organic matter, which enhances nutrient availability.