How common is genetic variation in nature?

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.