Carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.
All organic compounds contain carbon; most inorganic compounds doesn't contain carbon.