Final answer:
The adverb used in the given sentence is 'very'.
Step-by-step explanation:
The adverb used in the given sentence is very. An adverb modifies a verb, adjective, or other adverb and provides information about the degree or intensity of the action or quality being described. In this sentence, 'very' is describing the degree of beauty of the flower. For example, 'very' indicates that the flower is extremely beautiful.
Learn more about Adverbs