INVERTEBRATES

MOLLUSKS

• Soft bodies
• Thick muscular foot
• They take in oxygen through gills or lungs
• Some have shells

SPONGES

• Very simple animals
• Many pores in their bodies
• Specialized cells
• Get food and eliminate waste through this flow of water
• Water moves in a central cavity and out through opening at the top

ARTHROPODS

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

SEGMENTED WORMS

• Have long tube like bodies that are divided into segments
• Simplest organisms with a nervous system and blood vessels
• Long digestive tube runs through inner body
• Take in oxygen frim

ECHINODERMS

• Have arms that extend out from middle of body
• Have spines
• Have tube feet that take in oxygen from water
• Ex: sea stars, brittle stars, sea cucumbers