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Lack a backbone and may have external or internal skeletons.
Body can be divided into two symmetrical halves.
Through skin, gills, lungs, or tracheae.
Aquatic invertebrates with irregular bodies and pores.
By filtering water through their bodies.
Presence of tentacles with stinging cells.
Paralyze prey with stinging cells.
Oligochaetes, polychaetes, and hirudineans.
Sexually, with some being hermaphrodites.
They have a radial symmetry and an internal skeleton.
Facilitates locomotion using tube feet.
Through skin gills and the ambulacral system.
Carnivorous, detritivorous, or herbivorous.