Life first emerged in the oceans nearly three and a half billion years ago when they got more complexed they started to swim close to land years later they started to go on land for shorts times after a long time they involved to have lungs and stayed on land for longer but there still went back in the water to cool off but they can not breath in the water anymore. When it got dryer the Reptiles ruled the world so some Reptiles did not go in the water anymore.
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