Do beetles undergo complex (complete) metamorphosis?

Beetles do not undergo complex (complete) metamorphosis; rather, they go through a life cycle that includes four distinct stages: egg, larva, pupa, and adult. This process is indeed characterized as complete metamorphosis. The stages allow for significant changes in form and function, particularly between the larval and adult stages, which is a defining characteristic of insects that undergo complete metamorphosis.

The interstage transformations in beetles allow larvae, which typically have different diets and habitats compared to adults, to grow effectively without direct competition for resources. Therefore, the correct answer centers around the fact that beetles clearly do experience complete metamorphosis, thus validating the nature of their developmental process. Other options suggesting variability among different beetle species are inaccurate in this context, as all beetles follow the same life cycle format.