Answer:
(a) Haemocoel
is the blood-filled cavity in arthropods containing haemolymph.
(b) Medusa is a form
in cnidarians in which the body is shaped like an umbrella which can float
freely in sed water
(c)
Nematocytes are capsules of specialized cells in cnidarians which act as a paralyzing
sting.
(d) Para
podia are the paired un jointed lateral outgrowth in annelids bearing chaetae.
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