What stage comes first in complete metamorphosis?

In the process of complete metamorphosis, the first stage is indeed the egg. This is the initial phase of the life cycle for insects that undergo complete metamorphosis, which also includes the larva, pupa, and adult stages. The egg stage is crucial, as it is where development begins. After being laid, the egg provides a protected environment for the developing embryo until it hatches into the larval stage. It serves as the starting point of the insect's life cycle, allowing for significant transformation through the subsequent stadia.

As for the other stages, the nymph represents an immature form in incomplete metamorphosis, the pupa is a transitional stage that follows the larva, and the adult is the final stage ready for reproduction. However, they are not part of the initial stage in complete metamorphosis, which is always initiated by the egg.