Question

select the word or phrase that is redundant and can be removed without changing the meaning of the text.
new research suggests that plain female birds once had plumage that was as colorful and multihued as that of male birds today.
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Explanation:

The phrase "colorful and" is redundant because "multihued" already implies a variety of colors, which is similar to the meaning of "colorful". Removing "colorful and" does not change the overall meaning of the sentence.

Answer:

colorful and