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Organisms within the same species have differences. There are two types of this, genetic and environmental
Genetic variation
This is caused by the availability of different genes, it means that different characteristics inherited from your parents code how you are
Some characteristics are determined entirely by this - like flower colour, eye colour, blood group and inherited disorders
This is the area that a species live that can cause differences to be seen within a community of species - examples of these are loss of a toe, suntan or yellow leaves
Environmental variation
This is anything caused by the conditions you live in
Most characteristics
These are commonly controlled by both your genes and your environment - like your body weight, height, skin colour, condition of teeth, academic or athletic prowess
Plant example
The maximum height could be determined by its genes, whether it actually reaches that height depends on its environment