Which order includes crickets and grasshoppers?

The order that includes crickets and grasshoppers is Orthoptera. This classification is significant because Orthoptera is known for its members that undergo incomplete metamorphosis, characterized by having simple larval stages that resemble adults. Crickets and grasshoppers, which fall under this order, are well-known for their ability to produce sounds, or stridulate, which is a key part of their mating behavior.

Orthoptera also encompasses other characteristics, such as having two pairs of wings, with the hind wings typically broader and more membranous than the forewings. Understanding this classification helps in the study of their biology, behavior, and ecology, which is essential for effective pest management strategies in agriculture and horticulture. The other options represent different insect orders, each with distinct characteristics and members that do not include crickets or grasshoppers.