Sentence:  <WSD>Carbon</WSD> is the most common element in our bodies—indeed, in all living things on earth. 
Meaning of the word marked with <WSD> tags:  (Q623) The chemical element ("symbol" C) with an atomic number of 6. It can be found in pure form for example as graphite, a black, shiny and very soft material, or diamond, a colourless, transparent, crystalline solid and the hardest known material.