How do scientists know that? No one was there to see it, no one was there to see something evolve, no one was there to see life form, no one was there to see the big bang, etc.

Do you need to see a person walking across a beach to know someone walked across a beach or are foot prints in the sand enough? You do not need to see something directly to know it happened. We can see the effects of things and hypothesize their causes. By creating predictions based on those hypotheses and testing those predictions we can come up with a tested explanation for the effects we see. This is what science does, its called the scientific method.

The biggest problem with this argument (evolution wise) is that we have seen it! We have seen beneficial mutations in the lab and in nature, we have seen populations speciate. Evolution has been witnessed. This is what makes evolution a fact and a theory. Facts in science are observations, and theories explain those observations.
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