Egg, larva, pupa, adult beetle insect have the same genotype. Why do they have different phenotypes?

1) Different phenotypes at developmental stages are associated with adaptations to different environmental conditions.
2) The egg, larva and pupa of the beetle develop in the soil. The larva feeds and pupates there.
3) Occupying different habitats, the larva and the beetle do not compete for food and space.

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