Unlike most parasitic worms, polychaetes typically attach to their host externally.

A worm found in a stream that is attached to a rock by a posterior sucker is a member of the class Oligochaeta.

polychaetes are annelids that help aerate and mix layers of soil, improving the soil's quality.

The type of embryonic tissue that lines a true coelom is called mesoderm.

Annelids have a(n) ________________ circulatory system, in which blood is contained in a network of blood vessels.

The larvae of many marine annelids are ecologically important because they

What water conditions could be expected in an area where large numbers of mud-dwelling, filter feeding marine annelids are found?

Earthworms benefit gardeners because their tunnels provide passageways for

In earthworms, food is ground into small pieces in the

The body of an annelid has

The bristle like structures on some annelids' bodies are called

A type of worm that is an external parasite is the

Which of these animals has a true coelom?

In annelids, nitrogen containing wastes are eliminated by

In earthworms, inability to produce offspring might be associated with

Flatworms are in the phyla

Roundworms are in the phyla

Segmented worms are in the phyla

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