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.
No, the (earth) worm is not considered to be an insect. It is rather an annelid: a group of animals consisting of some types of worms, leeches, and a few other (but not all) bilaterally symmetrical organisms. In terms of diet, (earth) worms are detritivores, in which they eat decaying or dead organic matter such as dead leaves or decomposing fruit.