Wheel or Fire?

both are different...fire is not a invention it is natural....u can call wheel as invention....

Fire. Indeed fire isnt a innovation. but man discovered it. and innovated to lit the fire when he want. its has changed life. man got attorney over other creatures and saved him from long dark age to till now. Wheel has changed mans life afterwards. There were civilizations like Inka survived 1000s of years without wheels. I don't what was the case without fire. Even now, suppose we lost the fire... what will happen.

i think both..first fire and then wheel