What substance makes up to 70 to 95% of every cell in the humanbody

It is the combination of 4 Elements which are present in our body and there are - 1) Oxygen 2) Nitrogen 3) Carbon and 4) Hydrogen .

But 70 to 95% is Water                                                                                               Hope this helps! ~ Autumn :)

The elements - Oxygen, Carbon, Hydrogen and Nitrogen account for 96.2% of your body weight.