Metamorphosis is a biological process in which an organism undergoes a transformation from one stage of life to another. The term METAMORPHOSIS STAGES refers to the four stages of this process: egg, larva, pupae, and adult. The crossword solutions PUPAE (5 letters) and ADULTS (6 letters) refer to two of these stages. Pupae is the third stage of metamorphosis, during which the organism undergoes dramatic physical changes and develops into its adult form. ADULTS are the fourth and final stage of metamorphosis, when the organism has reached its full maturity.