The
answer is marine.
Explanation:
In the taxonomic
class of polychaeta, most annelids are marine and have parapodia and setae. Parapodia
are paddle like appendages used in swimming that also serve as respiratory
organs. Setae are bristles attached to parapodia that help anchor polychaetes
to their substratum and also help them move. The clam worms which as nereis are
active predators of annelid. Some
have well-built cephalization with a head having well-built jaws, eyes, and
other sense structures. Sedentary filter feeders have tentacles with cilia to make
water flows and to choose food elements. Only for the period of breeding do
polychaetes have reproductive organs. Polychaeta zygotes develop into a type of
larva similar to that produced by marine clams.
