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Chapter 2 (Mollusks (gastropods, bivalves, and cephalopods. (Bivalves-…

- - - - Some are herbivores.
        
        Herbivores are animals that only eat plants
        
        Others are carnivores
        
        animals that eat only meat
        
        No matter what they eat they all use and organ called a rudula.
        
        Flexible ribbon of tiny feet, to obtain food
      - Move by creeping along on broad foot
        
        Slippery mucus
    - - Filter feeder that strain tiny organisms from water.
        
        Gills
      - Babies float or swim in water/ adults move slowly on foot
      - Irritates mantle when a grain of sand is in it
        
        Can make pearl
    - - All carnivores/ radula
      - Large eyes/ good vision/ large brains
      - Swim by jet propulsion
- - - - Crustaceans- thrive in fresh water
        
        2-3 body sections, 5 or more pairs of legs, two pairs of antennae
      - gills
      - Metamorphosis- a process in which an animal's body undergoes dramatic changes in form during its life cycle
      - Arachnids- 2 body sections, four pairs of legs, no antennae
        
        Abdomen- hind section
        
        Spiders most popular
        
        Mites, scorpions, ticks
      - Centipedes and millipedes- 2 body sections, many pairs of legs
  - - - Protects animal
      - Molting- Process of shedding and outgrown exoskeleton
    - - antenna- appendage attached to head that contains sense organs.
- - - - undergo metamorphosis
- - - - Thorax usually has wings
  - - - Nymph- adult insect without wings
- - - - Insects can also be prey for other animals
      - Enrich soil
      - Can be eaten by humans
      - Move pollen among plants by spreading disease- causing organisms
        
        Pollonator
      - Humans use other insects to control pests