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“The cause of the disease is not well understood. We only know that genes and the environment play a major role (in it)”

Do I need the in it at the end of the second sentence? Why or why not?

1 Answer 1

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The extra pronoun at the end is not necessary, and in fact, sounds a little awkward since it would be redundant if written as one compound sentence:

The cause of the disease is not well understood, although we do know that genetics and environmental factors play a major role.

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