ok, earth history 101........this is the earth, itz full of nothing, except moisture.....sun becomes a G2 or a G1 star, itz gases/heat causes the earth's moisture to turn into water, and
voila, we got oxygen, carbon, and all the fun shit........then the shit freezes.......but it eventually unfreezes, then these little "bacteria" like organisms start sprouting up all over the place, in the water mind you, and after some evolutionary shit, one of 'em becomes a plant....ooh, exciting......in no time at all, the waters are filled with plants and bacteria like organisms, and eventually, aquatic life forms......then, plants come to land, as well as da fisheys, then the dino's come along and go "brawwr!" and eat everything before dying off, and somewhere along the lines humanity was born.........oh, and here's a little bit of fun information, other than simple celled organisms and aquatic life forms and shit, bugs were essentially the first creatures to come about.............think of this too, a wasp/bee/hornet, etc, are realated to ants!!!!!!