Sensory recption 9.1

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Stimulus Response

A stimulus is a change in the internal or external environment that produces a reponse.

Animals with the correct responses to stimuli have more chance of survival and then more chance of passing on their alleles.

This then gives a selective pressure to organisms with the appropriate responses.

Taxes: A simple movement towards or away from a stimulus. If it is towards the stimulus, for example bacteria moving towards glucose, then it is known as positive taxes, and if it is away from the stimulus, such as an earth worm


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