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What is agronomy? An agronomist, or crop scientist, studies plants and how they can be grown, modified, and used to benefit society. They use science to carry out experiments that create new techniques for agriculture production. Agronomy has existed and been important for humans since the invention of farming.

Internet: <unity.edu> (with adaptations).

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The last period of the text is in the present perfect tense in which “been” is the past participle of the verb to be.