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  • Communication
    • the need for a communication system
      • Organisms must be able to respond to changes in their internal and external environments.
    • Cell Signalling
      • Examples include nervous and hormonal
    • Negative Feedback
      • A process that brings about a reversal of any change in conditions. Ensures optimum state is maintained. Essential for Homeostasis.
    • Positive Feedback
      • A process that increases any change detected by the receptors.
    • Define Homeostasis
      • The maintenance of the internal environment in a constant state despite external changes.


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