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Changes
→Key Stage 4
: '''Sight''' allows [[animal]]s to detect shade and [[colour]].
: '''Sight''' is limited to the [[light|visible spectrum]].
: When an [[animal]] detects [[light]] [[Receptor Cell|receptor cells]] create an [[Action Potential|action potential]] which sends an [[Impulse (Biology)|impulse]] to the [[Central Nervous System|central nervous system (CNS)]].