After one week of life, the weight of five chicks of the same sex hatched simultaneously from the eggs of the same hen and fed on the same diet were 45g, 40g, 35g, 33g and 30g. This is an example of

After one week of life, the weight of five chicks of the same sex hatched simultaneously from the eggs of the same hen and fed on the same diet were 45g, 40g, 35g, 33g and 30g. This is an example of
A growth rate
B natural selection
C variation
D mutation

Answer is C

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