Scientists should definitely use evidence - and they collect this evidence though especially designed experiments. Based on their data and assumptions they build models which they then test, but they can base their conclusions based on the models too.
What they should not do is based the conclusions on opinions, because opinions are not imparcial- they can state them as opinions, but not as conclusions.
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The first answer is the right answer
New businesses benfit from freedom of a market economy by making new things that will make more money
They can share the same niche they might the same ansector so meaning the same background