"However, recent studies have shown that fish can also contain mercury, which is poisonous in large doses and has been linked to lower intelligence."
"However, recent studies have shown that fish can also contain mercury, which is poisonous in large doses and, which has been linked to lower intelligence." Many thanks.
Top answer
Yes, but no comma after 'and'.
— Mister Micawber
Yes, but no comma after 'and'.
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"However, recent studies have shown that fish can also contain mercury, which is poisonous in large doses, and which has been linked to lower intelligence."