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Metazoa (Proifera: are known informally as sponges (They are sedentary and…

- - - - reproduce asexually by budding
        
        "Chain worms"
    - - free living and parasitic species
        
        Trematodes
        
        have complex life cycles
        
        alternating sexual and asexual stages
        
        Tape worms
        
        Scolex contains suckers and hooks for attaching to the host
        
        Proglottids- units that contain sex organs and form ribbon behind scolex
    - - Gas exchange takes place across the surface by diffusion
  - - - chitons
        
        8 dorsal plates
        
        uses their foot like a suction cup and their radula to scrape algae
    - - snails and slugs
      - single, spiraled shell
    - - clams, oysters, and other bivalves
    - - squids, octopuses, cuttlefish, and chambered nautiluses
      - beak-like jaws
      - circulatory system
      - sense organs
      - complex brain
    - - Foot
      - Visceral mass
      - Mantle Cavity
        
        contains gills
        
        used for feeding and gas exchange
  - - - most are mobile
      - Many have parapodia
        
        paddle like or ridge like structures
        
        each parapodium has numerous chaetae, bristles made of chitin
    - - less mobile
      - some are tube- dwellers
        
        live in protective tubes
    - - earthworms
      - leeches - parasites that suck blood
        
        secret hirudin - prevents blood from coagulating
- - - - Jellies
      - Free living
    - - box shaped jellies
      - Parasitic
    - - alternate between polyp and medusa forms. reproduce sexually by budding
  - - - Symbiotic with algae
      - Forms reefs
  - - - used to capture prey
    - - specialized organelles that eject a stinging thread
    - - unique cells that funtion in defense and capture of prey