Question

is the group of words in bold a phrase or a clause?
did you know that tarantulas can survive for as long as two years without food?
phrase clause
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Explanation:

A clause has a subject and a predicate (a verb and what it relates to). The bolded part "can survive for as long as two years without food" has the subject (implied or part of the context, and the verb "can survive" with its modifiers). A phrase lacks a subject - predicate structure. So it's a clause.

Answer:

clause