12. Humans maintain a nearly constant level of hemoglobin by continually synthesizing and degrading it. This is an example of a(n):
(A) dynamic steady state.
(B) equilibrium state.
(C) exergonic change.
(D) free-energy change.
(E) waste of energy.

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統計： A(3), B(0), C(0), D(0), E(0) #2789661