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  • Biology B5
    • Skeletons
      • Animals such as a snail have a hard skeleton on the outside. This is called the external skeleton and is made out of chitin.
      • Animals such as fish and frogs have a skeleton inside their body.This is called an internal skeleton. It is made from cartilage or bone
      • Internal skeleton
        • It grows as we grow.
        • It allows muscles to be easily attached.
        • It has many joints to give flexibility.
        • It is made from living tissue such as bones cells, cartilage and blood cells.
      • Repair and growth of bones.
        • When bones and cartilage is damaged they can become infected with microorganisms


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