Broader definitions of chemicals or chemical substances can be found, for example: the term 'chemical substance' means any organic or inorganic substance of a particular molecular identity, including â (i) any combination of such substances occurring in whole or in part as a result of a chemical reaction or occurring in nature.
The major groups of worms include various species of flatworm, annelid, ribbon worm, spiny-headed worm, and aschelminth. Worms typically have an elongated, tubelike body, usually rather cylindrical, flattened, or leaflike in shape and often without appendages.
Marine Worms. Marine Worms-Annelids (Segmented worms). The annelids or Annelida (also called ringed worms), are a large phylum of segmented worms, with over 17,000 modern species including polychaetes, clitellates, ragworms, earthworms and leeches.arine Worms. Marine Worms-Annelids (Segmented worms). The annelids or Annelida (also called ringed worms), are a large phylum of segmented worms, with over 17,000 modern species including polychaetes, clitellates, ragworms, earthworms and leeches.