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Chapter 9 (invertbrates (animals without backbones (The main invertebrate…

- - - - Sponges
        
        Asymmetrical invertebrates
      - Cnidaerians
        
        Invertebrates that have stinging cells and take food into a central body cavity
      - worms
        
        All worms have bilateral symmetry, with a head and tail ends. They also have tissue , organs, and organ systems
        
        Flat worms:
        
        have flat, soft bodies. Some have eye spots on their heads that detect light
        
        Roundworms:
        
        Look like smooth, thin tubes. They have two body openings: mouth and anus.
        
        Segmented worms:
        
        Have bodies made up of many linked sections called segments. They are the simplest animals with a brain. Their brains help them detect food and predators
      - Mollusks
        
        Invertebrates with soft, unsegmented bodies that are often protected by a hard shell
      - Athropods
        
        Invertebrates that have hard outer covering
      - Echinoderms
        
        Invertebrates with a internal skeleton and a system of fluid-filled tubes
- - - - Notochord: A flexible rod that supports a chordates back
      - Nerve chord: Connects the brain to nerves in the other parts of the body
      - Throat pouches: Grooves between these pouches become gills
    - - cartilage: A tissue more flexible than bone used to make up the skeleton of a fish
    - - Monotherms lay eggs
      - Marsupials are born at an early stage of development, and they usually continue to develop in a pouch the mothers body.
      - Placental mammals develop inside its mother's body until its body systems can function independently.