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The most remarkable thing that can be readjusted by environmental cues is our body clocks

I think the subject and the compliment do not match and look awkward. What do you think?

1 Answers1

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The subject "thing" is singular, and so "is" is correct. It is grammatical.

The number of the predicate is not relevant.

For example:

Our team is 20 players.

(in American English)

The problem is Tom, Dick, and Harry.