At first I was going to say carbon, with is the most common element on Earth, but remembering that a human body was almost 70% water , and knowing water is mainly hydrogen ( 2 atoms of hydrogen per every one atom of oxygen) why was the answer oxygen , and not hydrogen?
I'm confused.
Does the oxygen in the lungs tip it in favour of oxygen perhaps ?
I'm confused.
Does the oxygen in the lungs tip it in favour of oxygen perhaps ?