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the introduction of harmful substances (pollutants) into the environment.
a group of atoms that are bonded together. It has an unequal number of protons and electrons and...
a polymer used in manufacture of synthetic resins, fibres and plastics.
monomers are chemically bonded together to form chains that link thousands of monomers in a...
(also called macromolecules) large, more complex molecules formed when monomers join together....
(also called or polypropylene) colourless transparent thermoplastic used where a flexible...