Annelids/Mollusks/Nematode Structure?

[LiL Homie]

What are 2 (for each) general structural similarites between:

Nematodes & Annelids?
Annelids & Mollusks?

I've been searching through my textbook, but they don't explain organism structure in detail. I would really appreciate your help. Thanks!

[Darby]

Things to consider -

Body coverings.

Larval forms.

Circulation (maybe).

Nervous systems.

Developmental structures.

Basic body layout & symmetries.

Digestive structures.