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Which one of the following is correct:
What do residential areas in a big city look like, and who lives there?
What do residential areas in a big city look like, and who live there?
There are more people there, so would "live" be correct?
Both are grammatical and are standard English. As to which is more appropriate, then, it depends on the author and on what the author is trying to say. Here's a post that has some related info: Which is the correct question (“Who has” vs “Who have”)?
– F.E. – 2015-03-05T00:24:32.263Notice that 'Is “who” singular or plural?' is quite a different question from 'Which one of the following [two alternatives] is correct [/ preferable]?'. – Edwin Ashworth – 2015-03-05T18:37:27.877