Answer:
Every living form
maintain a proper shape, size and structure. In multicellular lower organisms
the shape of body is maintained by certain biological materials like chitin and
calcium substances. Chitinous exoskeleton is the characteristic feature of
arthropods.
(e.g., cockroach,
termite.wasp) whereas, calcareous shell is present in mollusks (gastropods).
(e.g., snail and slugs).
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