試題詳解

32. What is the advantage of excreting nitrogenous waste in the form of ammonia?
(A) Ammonia is less toxic than uric acid.
(B) Ammonia is less soluble than uric acid.
(C) Ammonia excretion conserves energy.
(D) Ammonia does not diffuse across cell membranes.
(E) Ammonia excretion expends energy.