Still I don't get it. There are two creatures, the caterpillar and the butterfly. Which one came first?... Complete metamorphosis is a circular process as pict

Still I don't get it. There are two creatures, the caterpillar and the butterfly. Which one came first?... Complete metamorphosis is a circular process as pictured here: http://burns-classroom.weebly.com/module-6-plants-and-life-cycles.html http://burns-classroom.weebly.com/module-6-plants-and-life-c... Caterpillar (or larvae) turns into pupa; pupa turns into butterfly and butterfly (turns?) into egg; and egg turns into larvae and so on... I am curious to know which of these organisms came first. Did the butterfly exist before the caterpillar? Or were they two different species who entered into a symbiosis agreement? And why is it that the transformation of a seed into a tree not considered a metamorphosis? The seed and the tree are as different as the caterpillar and the butterfly.