Answer:
(i)They
are primitive animals.
(ii)They
are generally multicellular organisms with specialized cells but these cells do
not group together to form tissures.
(iii)Most
of them are marine, i.e., found in the seas. Some of them are also found in
ponds and rivers.
(iv)
They possess pores all over the body.
(v)
Reproduction can be both sexual and asexual methods.
(vi)
Sensory system is absent.
(vii)
Mouth and anus are absent.
(iiii)A
distinct canal system with inlets and outlets for water circulation inside the
body is present. They obtain food and oxygen by means of water. The collar
cells filter out food particles from the water current flowing through the
canal system.
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