1. Animals that do not have a backbone.
Invertebrates
Animals that do not have a backbone.

2. Sponges(Poriferans)
Many pores and canals
Do not move around, live most of their lives attached to things-sessile
No tissues or organs-simplest animals
No symmetry

3. Coelenterates Tentacles Stinging cells One opening
No organs, only tissues
Radial symmetry

4. Mollusks Soft bodies Some have shells Bilateral symmetry
Some with tentacles or arms with suction cups
scallop

5. Arthropods have a segmented body, jointed legs,
exoskeletons(hard outside covering)
Bilateral symmetry

6. Echinoderms spiny skin, rays or arms tube feet Radial symmetry
Water Vascular System

7. Worms Long tube-like bodies May be flat Usually no definite head
No legs or antenna