Which is a correct statement about mutations?
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a. mutations ensure alleles never change.
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b. mutations decrease variety in the population.
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c. mutations are always bad.
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d. mutations increase variety in a population.

d. mutations increase variety in a population.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.