Which type of insect does NOT undergo metamorphosis?

Springtails are classified as simple metamorphosis, which means they do not undergo the complete metamorphosis process that many other insects do. Instead, they hatch from eggs into nymphs that resemble small adults. This is a significant characteristic of springtails, as they go through multiple growth stages, but these stages do not involve the dramatic transformations associated with complete metamorphosis, such as the pupal stage found in insects like butterflies or beetles.

In contrast, termites, cockroaches, and beating flies all participate in some form of metamorphosis. Termites undergo an incomplete metamorphosis, transitioning through egg, nymph, and adult stages, while cockroaches also experience a similar process. Beating flies, on the other hand, go through complete metamorphosis, which involves distinct larval, pupal, and adult stages. This differentiation in developmental processes is why springtails are the only option listed that does not undergo metamorphosis in the traditional sense.