Question

is the group of words in bold a phrase or a clause?
the malleus, incus, and stapes—also called the hammer, anvil, and stirrup—are the
bones in the ears of all mammals that help transmit sound vibrations.
phrase \t clause
submit

Explanation:

A phrase is a group of words without a subject - verb relationship, while a clause has a subject and a predicate (verb). The bolded group “bones in the ears of all mammals” has no verb (action or state - linking verb relationship with a subject), so it's a phrase.

Answer:

phrase