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Wk 29: Lifecycles of Insects/Complete and Incomplete Metamorphosis Complete Metamorphosis a kind of insect development which includes four life stages an egg, a larva, a pupa and an adult stage. Incomplete Metamorphosis the development of certain insects that includes three distinct life stages – the egg, the nymph, and the adult stage. Life Cycle the series of distinct stages of life that most organisms grow and mature through. Stages Egg A distinct step or period of development, growth, or progress. the first stage in the life cycle of most insects. Wk 29: Lifecycles of Insects/Complete and Incomplete Metamorphosis Larva the immature, wingless, feeding stage of an insect that undergoes complete metamorphosis. Pupa the nonfeeding, usually immobile, transformation stage between the larva and the adult stage. Adult the stage at which an organism is fully developed and can reproduce. Nymph the immature form of those insects that do not pass through a pupa stage. Nymphs usually resemble the adults, but are smaller, lack fully developed wings, and are not able to reproduce. Molting to shed, or loose, an outer skin for replacement by a new growth.