Simple responses keep simple organisms in a favourable environment.

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Simple responses keep simple organisms in a favourable environment.

 

Simple organisms, e.g. woodlice and earthworms, have simple responses to keep them in a favourable environment. Their response can either be tactic or kinetic:

 

Tactic responses (taxes) – the organisms move towards or away from a directional stimulus. For example, woodlice show a tactic response to light (photo taxis) – they move away from a light source. This helps them survive as it keeps them concealed under

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