"So the upper crust of the Earth had finished cooling to form land upon which we walk. With this the crust split into plates with tectonic forces underneath these plates driving change and reforming the surface of the land, primal oceans formed over the oceanic plates. And within these oceans the first life evolved, though still single-cell as the atmosphere of the Earth had not yet formed so solar radiation hit the Earth and gases were highly methane, carbon dioxide and nitrogen. But this mini-life gave off oxygen, which reaction with metals first and was taken deep within the Earth. However soon there was enough oxygen to form different life and then more complex life. Eventually the old lifeforms using the old atmosphere died out and new life formed to the oxygen present air. Fish appeared and took over the oceans; and when they were bored of that they became lung fish to escape onto land, and lungfish soon gave way to amphibians! Amphibians came upon land to find many lifeforms such as insects had beaten them too it. They weren't having that so some of them became reptiles! Reptiles gave way to mammal-like reptiles, vegeterean reptiles, flying reptiles, some even returning to the sea, and then a group pushed its way forward and had become dinosaurs! Of course this was just after the Permian mass extinction where life on Earth had been struck suddenly by an unknown disaster. Three great mass extinctions had happened before this and the dinosaurs were ready for a turn. So after some time a few dinosaurs gave way to the light-weight design of birds and mammal-like reptiles became more mammal-like. Thus both of these survived the K-T mass extinction. Moving on - birds briefly took over the Earth as the dominant predators and put terror into the hearts of the little mammals until later when the mammals grew back at them and dominated. Come the most recent ice age mammals were everywhere and a missing link had evolved into something more intelligent and capable..."