Coal, oil, and natural gas
a.
are renewable natural resources.
b.
are in very short supply for consumers.
c.
release carbon dioxide when they are burned.
d.
are clean fuels that contribute little to pollution.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

it means there are 3 atoms of oxygen