a caterpillar is a mean of steels & sizes is when an carries preference from an immature relation to an youth relation ->  metamorphosis is when a butterfly changes from an immature form to an adult form  the immature relation of a caterpillar is called a butterfly & the youth relation of a butterfly is called a caterpillar ->  the adult form of a caterpillar is a butterfly and the immature form of a butterfly is a caterpillar  metamorphosis is when a butterfly changes from an immature form to an adult form & the adult form of a caterpillar is a butterfly and the immature form of a butterfly is a caterpillar -> metamorphosis is when a butterfly changes from caterpillar to a butterfly