In what has been called an earth-shattering discovery , evidence of life on Mars was recently uncovered. A)adjective B)adverb C)noun D)verb E)preposition

Name: In what has been called an earth-shattering discovery , evidence of life on Mars was recently uncovered. A)adjective B)adverb C)noun D)verb E)preposition
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The word "discovery" is a noun, as it refers to the act or process of discovering something, in this case, evidence of life on Mars.

In What Has Been Called an Earth-Shattering Discovery