History of animals 1 The Cambrian MYA

 It is really hard to beilive that when first earth formed which was 4.6 billion years ago gained life a few million years after that. The first life visable to human eye was starfishes and jellyfish very very simple organisms.The first fish evolved somewhere between the cambrian and the devonian period. It was so much time ago that not even plants evolved yet, and the oxygen precentage was lower than before. If you go back to the cambrian period you would see a lot of dead bodies on the sea shore because there are just no scavengers to pick on them. One of the giants of that period was the orthocone a giant sea monster that hunted sea scorpians. Imagen you had no eyes and you can only find were light is, and you have a wonderful sense of smell. HOW would you live what would you do? Orthocone does not really relyed on his sight in fact eyes were just forming on the earth. The orthocone used to smell prey and that is how it hunted.