Sensing the Environment

Organisms at all levels of complexity are constantly subject to variations in factors impinging on them from the external environment. It is obviously in the interest of the organism to match as closely as possible its activity to these variations. Any mismatch can be remedied by the organism according to one of three general strategies (Fig. 1), namely, (1) modification of the environment, (2) modification of the organism itself, or (3) migration to a more favorable environment.

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