Question

why are the three stage and four stage life cycle similar

Answer 1

There are two groups of insects. In the first group, including insects such as cockroaches, grasshoppers, dragonflies and bugs, the wings develop gradually on the outside of the body and get larger at each moult until they are fully formed. The young stages of these insects are called nymphs and they usually resemble the adults in general appearance, often inhabiting the same places and eating the same kinds of food. This group has a 3-stage life cycle.