Tobacco contains nicotine, which is a substance that stimulates the heart.
Please correct the sentence. And I'd like to know whether a comma should be placed before 'which' or not.
anonymous I'd like to know whether a comma should be placed before 'which' or not. Yes, you need a comma — unless there are two or more kinds of nicotine and only one of them is a substance that stimulates the heart — which I doubt. CJ
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anonymousI'd like to know whether a comma should be placed before 'which' or not.
Yes, you need a comma — unless there are two or more kinds of nicotine and only one of them is a substance that stimulates the heart — which I doubt.
CJ