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===About Variation===
: There is [[variation ]] between different species; different species look different from each other.: There is [[variation ]] within a species, creatures of the same species don't look exactly the same as each other.
: '''Variation''' is useful to help a species survive. If everyone was the same, what kills one person might kill everyone.
: '''Variation''' within a [[species]] can be [[Inheritance|inherited]] or caused by the environmental. Some people are born with 3 fingers (inherited variation) but others might lose fingers in an accident (environmental variation).
| style="height:20px; width:200px; text-align:center;" |These mice are identical twins, but one has damaged its tail. The difference is an example of '''environmental variation'''.
| style="height:20px; width:200px; text-align:center;" |One of these identical twins has decided to grow a mustache the other has decided to shave completely. This is '''environmental variation'''.
|}
==Key Stage 3==
===Meaning===
'''Variation''' is the difference between living creatures.
===About Variation===
: There is [[variation]] between different species; different species look different from each other.
: There is [[variation]] within a species, creatures 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]].
===Continuous Variation===
: '''Continuous variation''' is '''variation''' where the differences change gradually across the [[species]].
Some examples of '''continuous variation''' are:
*Height
*Weight
*Nose Length
{| class="wikitable"
|-
|[[File:HeightBellCurve.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |This [[graph]] shows how height varies across a population of humans.
|}
===Discontinuous Variation===
: '''Discontinuous variation''' is '''variation''' where the creatures fall into specific categories where they can only be one or the other, not half way in between.
Some examples of '''discontinuous variation''' are:
*Eye colour
*Number of legs
*Ability to roll the tongue
{| class="wikitable"
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|[[File:BarChartEyeColour.png|center|400px]]
|-
| 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.
|}