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→Key Stage 3
| style="height:20px; width:400px; text-align:center;" |This [[Bar Chart]] shows the number of people in a class with each eye colour. They cannot be half way between blue and brown, so eye colour is discontinuous.
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==Key Stage 3==
===Meaning===
'''Variation''' is the difference between [[organism]]s in an [[ecosystem]].
===About Variation===
: There is [[variation]] between different [[species]]; different [[species]] look different from each other.
: There is [[variation]] within a [[species]], [[organism]]s of the same [[species]] don't look exactly the same as each other.
: [[Variation]] can be [[Continuous Variation|continuous]] or it can be [[Discontinuous Variation|discontinuous]].
===Genetic Variation===
: Most of the [[variation]] between different [[species]] can be accounted for by the [[DNA]] differences between those [[species]].
: [[Variation]] within a [[species]] is the result of both [[genetic]] and environmental factors.
The greater the [[genetic]] [[variation]] within a [[species]] the more likely a [[species]] will survive changes in the environment. Individuals may die, but with enough [[variation]] some of them will be better [[Adaptation|adapted]] to the change in their environment.