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…showed last 75 words of 1078 total…if you have the luxury of defining the universe you're operating in. In the real world, we must deal with levels of certainty based on observed evidence. The more and better evidence we have for something, the more certainty we assign to it; when there is enough evidence, we label the something a fact, even though it still isn't 100% certain. It is certainly possible to still be a good biologist and not believe in evolution.