Classification

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  • Classification
    • Organisms are classified into groups based on how closely related they are to one another.
    • All living thing are divided into five kingdoms
      • Fungi
        • Fungi are saprophytes (they feed of dead organisms and decaying material). They are multicellular and have a cell wall but don't have a chlorophyll.
      • Animals
        • Animals are heterotrophs. They are multicellular but they don't have a cell wall or chlorophyll.
      • Protocists e.g. algae
        • Protocists are unicellular and have a nucleus.
      • Plants
        • Plants contain chlorophyll and are autotrophs. They are multicellular and have rigid cell walls.
      • Prokaryotes e.g. bacteria
        • Prokaryotes are unicellular but they don't have a nucleus.
    • Vertebrates
      • Fish
      • Amphibians
      • Reptiles
      • Mammals
      • Birds
      • Scientists divide vertebrates into these classes based on three things:
        • 2. How they reproduce - external (e.g. fish) or internal fertilisation. Also whether they are oviparous (lay eggs e.g. reptiles), or viviparous (give birth to live young e.g. mammals)
        • 1. How they absorb oxygen - through lungs (e.g. mammals), gills (e.g. fish) or skin (e.g. amphibians)
        • 3. How they regulate their body temperature - homotherms (body temperature is regulatied by homeostatis e.g. mammals)  or pokilotherms (body temperature changes with external temperature e.g. reptiles)

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