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Classification - Coggle Diagram

- - - - So it makes sense that everyone works with the same model
    - - Changes
        
        In species to help monitor the effect of environment and human activity
        
        In the numbers of species in an environment
      - Adaptations
        
        Within a species
  - - - Based on the ecological niche occupied by an organism
      - The problem is niche definitions vary and many species occupy more than one niche
    - - Based on unique fertilisation system, including mating behaviour
      - The problem is that many species will mate with other species and may even produce fertile offspring, but are different species
    - - based on DNA evidence
      - The problem is people still have to decide how much genetic difference is needed for 2 organisms to be different species
      - Also, collecting DNA is difficult, expensive, and takes a long time
- - - - True bacteria that we normally think of when we're describing bacteria that cause, like, diseases
  - - - Very diverse group of microscopic organisms
    - - All heterotrophs
    - - Almost all autotrophs, making their own food by photosynthesis using light captured by chlorophyll
    - - All heterotrophs that move their whole bodies around during at least one stage of their life cycle
  - - - Ancient bacteria thought to be early relatives of the eukaryotes
- - - - .
        
        Hagfish
        
        Lampreys
      - .
        
        Sharks and rays
        
        .
        
        Ray-finned fish
        
        .
        
        Coelacanth
        
        .
        
        Lungfish
        
        .
        
        Amphibia
        
        ,
        
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