47. Animals are totally dependent on plants and microorganisms for nitrogen fixation and nitrate assimilation because animals:
(A) do not have the reducing power (NADPH) to fix nitrogen.
(B) lack the enzyme aminotransferase.
(C)lack the enzymes to reduce 61d67ac20ddf1.jpg
(D)lack carbamoyl-phosphate synthetase I.
(E)lack glutamate dehydrogenase.

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統計： A(0), B(1), C(0), D(0), E(0) #2847576