Read the sentences. Many vegetables are the roots of plants. Carrots are roots. Beets are as well. However, carrots are usually long and slender, while beets are red and round.

Which word or words signal that two things are being compared?

while
are usually
as well
however

The word “while” is being used as a signal that two objects are being compared.

Explanation: When then sentence says “carrots are usually long and slender, while beets are red and round” the word while is used after describing the carrots. Then the sentence describes beets. The word “while” is used as a signal that the two are being compared because the word is used to show how the carrots and beets are different.

I’m not sure what it is i sorry