A more pressing question for conservationists is how did the species arrive.
Can I write as follows?
A more pressing question for conservationists is how the species arrived.
Yes. That is how you should write unless you are going to use quotation marks, as in A more pressing question for conservationists is "How did the species arrive?.
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Yes. That is how you should write unless you are going to use quotation marks, as in A more pressing question for conservationists is "How did the species arrive?.