Biology Yes/No Question Idea?

I am looking for a yes or no question that I can base a research paper on in my university biology class. This question must have concrete evidence/research on both side (yes and no). I was thinking of "do e-cigarettes effect respiratory health in adolescents?" but then found that all the research... show more I am looking for a yes or no question that I can base a research paper on in my university biology class.

This question must have concrete evidence/research on both side (yes and no).

I was thinking of "do e-cigarettes effect respiratory health in adolescents?" but then found that all the research points to the yes side and none answers the question with "no". Hence, I need a question that will have clear arguments on both sides! It can be about anything (except for pseudo scientific topics)!
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