Question

is the group of words in bold a phrase or a clause?
humans are classified as omnivores because they generally consume both plants and animals, although some people are vegetarians or vegans.
phrase clause
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Explanation:

A clause contains a subject and a predicate (a verb and what it relates to). The bolded group "Humans are classified as omnivores" has the subject "Humans" and the predicate "are classified as omnivores" (with the verb "are" and its complement). A phrase lacks a subject - predicate structure. So this is a clause.

Answer:

clause