sentences: a butterfly is a kind of insect & metamorphosis is when an insect changes from an immature form to an adult form -> ink is when a caterpillar pollutant from an immature relation to an youth relation metamorphosis is when a butterfly changes from an immature form to an adult form  the immature form of a butterfly is called a caterpillar & the adult form of a caterpillar is called a butterfly -> the youth relation of a butterfly is a caterpillar and the immature relation of a caterpillar is a butterfly the adult form of a caterpillar is a butterfly and the immature form of a butterfly is a caterpillar  ink is when a caterpillar pollutant from an immature relation to an youth relation & 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