12. The nitrogenous waste product in bears (mammals) is _____ , while most saltwater fish get rid of wastes through _____.
(A) ammonia; urea
(B) uric acid; urea
(C) urea; ammonia
(D) ammonia; uric acid
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統計: A(0), B(0), C(3), D(1), E(0) #3386719
統計: A(0), B(0), C(3), D(1), E(0) #3386719