OCR Biology A2

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  • Created by: Laura
  • Created on: 05-05-13 12:00

Communication

Outline the need for communication systems within multicellular organisms...

·         1. External environmental changes

o   Changes in the external environment can cause stress.

o   It may change slowly so there will be a gradual response.

o   It may be a quick change so a rapid response is needed.

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