Many animals go through a stage of life called metamorphosis when they change from one form into another. For examples, wormy caterpillars eventually have a long sleep and awake as beautiful butterflies. You can watch a similar transition take place in the comfort of your own classroom.
Place mealworms inside and secure lid.
In a few months the mealworms will develop into beetles. When they do place some potato or apple chunks in for the adults to feed on. After the adults mature, they will lay eggs that turn into mealworms and the life cycle begins again. Set some of you beetles free once they develop, or keep them as classroom pets.