Sugar

Sugar is made from the element s hydrogen, oxygen and carbon.

image souce : http://beaut.ie/blog/?tag=sugar-cravings

Cells

If one cell was taken everyone living on earth and all the DNA was removed, it would weigh only 0.024g

image source:http://www.kscience.co.uk/as/module2/dna_structure/DNA_files/History%20of%20DNA%20research.htm