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The diagram represents the butterfly’s life cycle which consists of fours stages.
Butterfly begin life as eggs which are laid by adult butterflies after mating. Those eggs stay at the plant between two and three weeks and then develop into the embryo at their second stage of the lifecycle. During this stage, one embryo grows up to a caterpillar, before they enter the next step.
After about two months, a pupa will create by the caterpillar that completes the growth of skin-shedding. The shape of pupa does not remain for long, just around two hours, and the metamorphosis happens which means that the lifecycle goes into the final stage called Pupal stage. During the phase, the metamorphosis stays about two weeks, after which it becomes the adult butterfly.
The adult butterflies will mate with their counterpart and lay eggs on some plants, and then the cycle starts anew.