INVERTABRATES

MOLLISKS

• Soft bodies
• Some have shells
• Thick muscular foot
• Take in oxygen through gills or lungs
• Have organs

SPONGES

• Very simple animals
• Have many pores in their bodies
• Water moves into a central cavity and out through an opening at the top
• They get food and eliminate waste through this flow of water
• Specialized cells for obtaing food and oxygen from the water

ARTROPODS

• Jointed legs
• Segmented bodies
• Some have wings
• Have exoskeletons
• Breathe through gills or air tubes

SEGMENTED WORMS

• Have a long tube like body that is divided into segments
• Simplest organism with a nervous system and blood in vessels
• Long digestive tube that runs through their body
• Take in oxygen from the water through their skin

ECHINODERMS

• Have arms that extend out from the middle of their body
• Have tube feet that take in oxygen through the water
• Have spines