Answer:
(d) Sea urchins is not an annelids. They called as
sea hedgehogs are small spiny globular animals of phylum-Echinodermata. They
are found in almost all the oceans. Common colours include black, dull shades
of green, olive, brown, purple, blue and red.
Annelids are triploblastic animals having billaterally
symmetrical body. They bear metameric segmentation and are the first
coelomates. e.g.. Nereis, earthworm and leech.
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