INVETBRATES

MOLLUSKS

• Soft biodies
• Thick muscular foot for moving and opening/closing their shells
• Have orgins
• Take in oxygen through gills or lungs
• Some have shells

SPONGES

• Very simple
• Have pores that take in water with food/oxygen
• Water flows through pores out the top hole
• Waste leaves out the top hole
• Specialized cells take food and oxygen out of the water

ARTHROPODS

• Jointed legs
• Segmented bodies
• Some have wings
• Have exoskeleton
• Get oxygen through gills or air tube

SEGMENTED WORMS

• Long tube-like bodies
• Simple animals but major orgen systems
• Nervous s systems with brain
• Blood vessels with hearts
• Take in oxygen through water that goes through the skin

ECHINODERM

• Arm that extend from middle of body
• Tube feet that take in oxygen & water
• Have spins/spikes