Question

is the group of words in bold a phrase or a clause?
the hippopotamus, an extremely dangerous and highly aggressive animal, will attack if it is provoked or feels threatened.
phrase clause
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Explanation:

A phrase is a group of words without a subject - verb pair, while a clause has a subject and a verb. The bolded group “an extremely dangerous and highly aggressive animal” has no verb (it's a noun phrase describing “the hippopotamus”), so it's a phrase.

Answer:

phrase