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chapter 8 (what is an animal (functions of an animal (obtain food and…

- - - - pouch of kangroo
  - - - all animals are ether vertebrates or invertebrates
  - - - tissue
        
        id s group pf simular cells that preform a specific function
      - organs
        
        is made up of different tissue
        
        an organ preforms more complex functions than the tissue that makes it up could preform alone groups of organs make up organ systems
  - - - if many imaganary lines could be drawn through a centrol point to divide it into teo mirror images
      - many different lines can be drawn
    - - if only onen line of symmetry can be drawn to divide throught a centrol point to divide it into halves thay are mirrow images
    - - the bodies of animals without symmetry are organized simply with some specialized cells but non tissue in contrast animals with radial symmetry have complete body plans with tissue and usually with aorgan systems animals with bilateral symmetry have organ systems
- - - - is a flexible rod that supprts the back
    - - runs down thier back
      - connects brain ot nerves
  - - - changes with envirment
    - - body heat is controled
  - - - lives in water and uses fins to move
      - ectotherm
      - have scales
      - obtain ozygen through gills
      - classification
        
        jawless
        
        have no jaws or scales
        
        they scap suck and scap for their food
        
        skeltons are made of cartolige
        
        cartilagious
        
        jave skales and jaws
        
        bony fish
        
        jaes scales and pockets that hold the gills
        
        skeleton made of hard bone
    - - endotherm vertabrate that lays eggs and has feathers and four chambered heat
        
        have wings to fly
        
        nearly holloe bones
        
        only modern animals with feathers
    - - is an ectotherm vertabrea that has scaly skin and lungs and lays eggs on land
        
        to live on land they have adaptations
    - - is a vertabrate that is ectotherm and spends its early life in water and its adult life on land
        
        return to water to lay eggs and reproduce
- - - - asymmetrical invertabrates
      - specialized cells but no tissue or organs
      - they stay in one place thier whole lives
      - they take food into thier bodies to get energy
    - - jelly fis hare cnidarians
      - they are invertabrates that have stinging cells and take food inot a centrol body cavity
      - redial symmetry
      - lack organs have some tissue
    - - bilateral symmetry
      - head and tail
      - habe tissue organs and organ systems
      - eye spot on head to detect light
      - classification
        
        roundworms
        
        smooth thin tubes
        
        body openings
        
        flat worms
        
        segmented worms
        
        bodies made of many linked sections called segments
        
        siplist animal witha brain
    - - invertabrates with soft unsegmented bodies that are ofteb protected by a hard shell
        
        have thin layer of tissue called mantle
        
        internal organs called foot
        
        classifications
        
        gasstropods
        
        they have a singlw shell or no shell
        
        distinct heads
        
        bivalves
        
        two shells
        
        simple nervous system
        
        cephalopods
        
        may have internal or external shell or no shell at all
        
        good vision
        
        large brains
    - - invetabrate that has an internal skeleton and a system of fluid filled tubes
        
        have radial symmetry
        
        use internal tubes ti move and obtain food and oxygen
    - - invertabrates that have hard outer coverings segmented bodies and pairs of jointed appendages
        
        exoskeleoton
        
        outer skeleton