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In line with what I said before, I think that science often connects with questions three and four. 

Take question three, for example. In some cases science can allow us to settle an ethical dispute - perhaps by helping us to predict the empirical consequences of an action or a class of actions. 

Or take question number four. In some cases, a proposed ethical principle or judgment may conflict with the best scientific knowledge. In that case, science would limit the number of acceptable principles or judgments.