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VARIATION
the variation of shoe size is natural
An allele is a variation or a type of gene
Tsunami
Artificial selection.
There are infinitely many types of variation.
VARIATION
the variation of shoe size is natural
Sound waves can't be generated in a vacuum.
potential
Hydroelectricity.
An allele is a variation or a type of gene
Thermoreceptors react to variation in temperature.
The right energy
Gay
Tsunami
Laissez-faire type of leaders give full freedom to their employees.