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Which one of the following criteria is necessary for natural selection to occur? A. Individuals show no variation in fitness levels. B. Individuals have the same adaptations. C. A struggle for existence is apparent. D. Enough resources exist for individuals to survive and thrive.

Respuesta :

The answer is C. A struggle for existence is apparent.
c. 
it is not a, because variation is necessary for natural selection
it's not b, because variation is necessary for natural selection
it's not d because natural selection will not occur if the organism is well adapted to its environment.  

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