Fill in the blanks: Carbon is one of the most important (i) ___ on earth. All living (ii) have carbon in their bodies. Carbon gets together with other elements and can build long (iii) . Carbon and (i

Here are the completed sentences:

Carbon is one of the most important (i) elements on earth. All living (ii) organisms have carbon in their bodies. Carbon gets together with other elements and can build long (iii) chains. Carbon and (iv) hydrogen are examples in petroleum and gas. (v) Carbon dioxide is in the air that we breathe out.