According to paragraph 3 what is the advantage of hydroponics for research on nutrient de

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According to paragraph 3, what is the advantage of hydroponics for research on nutrient deficiencies in plants?

A.It allows researchers to control what nutrients a plant receives.

B.It allows researchers to observe the growth of a large number of plants simultaneously.

C.It is possible to directly observe the roots of plants.

D.It is unnecessary to keep misting plants with nutrient solutions.

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