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Why can't plants use N2 directly as a nutrient?A) Plants lack the enzymes necessary to convert N2 into NO3−or NH4+.B) Plants must use NO3− to carry out nitrogen fixation.C) Most soils are depleted of N2 as a nutrient.D) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be "fixed" to remain in leaves.E) The N2 molecule is too large to enter the stomata.

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