Which best describes probability?

the chance that something will happen

Explanation:

Probability is the extent to which something is probable; the likelihood of something happening or being the case. It is the chance that something will happen.

We say it is the likelihood of an event happening, an event being a set of outcomes of an experiment to which a probability is assigned.The probability of a given event is a measure of the likelihood that the event occurs. Probability, itself, is the branch of mathematics which studies how such a measure can be calculated or estimated and of how the probabilities of events can be combined.

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what following? you said which of the following. but there is no be more specific.

i think the answer is a.keratin is the pigment responsible for skin color.