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D
Communication
1.1 The characteristics of life and the need for communication in multicellular organisms

The characteristics of life
Scientists have long debated what the criteria for life are, and there is still no definite answer. Take, for example, viruses ­
which to this day scientists have still not agreed…

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Positive feedback
The other type of feedback, which is much less common than negative feedback, is called positive feedback. This type of
feedback usually doesn't lead to homeostasis, as the effector actually increases the change detected by the receptor, and
so it can be seen as a `vicious cycle' approach.…

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