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.
The pinworm, also known as threadworm, seatworm is a very common intestinal parasite. Enterobiasis, or oaxyuriasis refers to the medical condition associated with pinworm infestation.Pinworm is the most common type of roundworm found in the USA. They are parasites that use the human body to survive and reproduce.he pinworm, also known as threadworm, seatworm is a very common intestinal parasite. Enterobiasis, or oaxyuriasis refers to the medical condition associated with pinworm infestation.