A population of birds has many small variation among the individuals in the population. Variation in beak size among these birds would affect their survival most if the

the type of food changes

Explanation:

Natural selection is the force by which populations adapt and change (or evolve), increasing the prevalence of advantageous phenotypic traits. According to the evolutionary theory proposed by Darwin, organisms that are better suited to the environment are selected through the mechanism of natural selection. In this case, birds with beaks better suited to the type of available food in the area will be more chances to survive and reproduce, perpetuating their genes in the next generation.

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explanation:

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