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Keywords for B6
21st Century Science OCR

Response
Action or behaviour caused by a stimulus
Stimulus
A change in the environment that causes a response
Behaviour
Everything an organism does. It's response to all the stimuli around it
Simple Reflex
An automatic response made by an animal to a stimulus…

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A tiny gap between neurons that transmit nerve impulses from one neuron to another by means of
chemicals diffusing across the gap
Receptor Molecules
A specific molecule on the surface or inside of a cell with a characteristic and physical structure
Nanometres
A metric unit of length that equals to…

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