1. INVERTEBRATES

2. PORIFERA
SPONGES

3. Simple animals
Asymmetrical
Sessile
No tissues
Filtering animals
Oxygen and nutrients
come in through
diffusion
Sexual and asexual
reproduction

4. CNIDARIA

5. Radial symmetry
Tentacles sorrounding the mouth
Oxygen come in through difussion
Sexual and asexual reproduction
Polypoid shape and medusoid shape
Jellyfish can swim
Polyps are sessile and can form colonies (corals)

6. PLATYHELMINTES

7. Bilateral symmetry
Absorb nutrients through the pharynx or through
the skin
Planarian live in fresh or salt water
Tapeworms are parasites

8. NEMATODES

9. Bilateral symmetry
Parasites
Complete digestive system with mouth and anus
Sexual reproduction
Oxygen enters by difussion

10. ANNELIDS

11. Segmented worms
Complete digestive system
Most are hermaphrodites
Oxygen comes through the skin
Terrestrial worms swallow dirt and filter out food
Some are parasites and feed on blood

12. MOLLUSKS

13. Bilateral symmetry
Circulatory system
Filter feeders, grazers, predators
Oxygen taken through gills or lungs
Most are aquatic

14. ARTHROPODS

15. Bilateral symmetry
Segmented body
Exoskeleton
Oxygen enters through tracheal tubes, gills or
book lungs
Sexual reproduction
Complex nervous system

16. ECHINODERMS

17. Marine animals
Radial symmetry
Endoskeleton
Ambulacral system (water circulatory system)
Some are predators, some filter feeders
Sexual reproduction
Regeneration possible in some