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A change in your environment that causes a response is called a stimulus. Behaviour is the response to a stimulus.

Simple animals always respond to a stimulus in the same way. An example of this is when woodlice always move away from light. These are called simple reflex responses. Reflex's are always involuntary. They are important because they increase an animal's chance of survival.

Simple reflex actions help an animal to escape from predators, avoid harmful environments and find…


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