Read the following sentences to find out whether there is any grammatical error in them. The error if any will in one part of the sentence. Mark the part with error as your answer. If there is no error, mark 'No error' as your answer. (Ignore the errors of punctuation, if any)
Scientists are increasingly concerned (a)/ about the potential longterm effects (b)/ of global warming on our (c)/ natural environment and on the planet. (d)/ No error (e)
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