Colon is a punctuation mark which should be added before the statement of the Derwent University's Professor Andrew Higgins.
In punctuation, colon is generally used between two independent clauses. This is done so that the meaning of both the sentences can be completely understood. Colon is used to separate two sentences in a long sentence.
Punctuation marks refer to the commas, period, etc which are used while writing sentences to separate the meaning of certain words and give break in the sentences.
In the given passage, a colon should be added before the statement of the University's professor.
Therefore, the sentence would look like-
Derwent University's Professor Andrew Higgins told her: 'It's a once-in-a-decade opportunity that people really shouldn't miss.
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