Question

complete the sentence with the correct comparative or superlative adverb.
well
ferns grow
in shady locations than in direct sunlight.
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Explanation:

To complete the sentence, we need to use the comparative form of the adverb "well". The comparative form of "well" is "better". The sentence is comparing how ferns grow in shady locations versus direct sunlight, so a comparative adverb is appropriate here.

Answer:

better