排泄产物;
Which of the following is not an excretory product?
下列哪项不是排泄物?
Ammonia from protein digestion, the primary excretory product, is converted to urea to be excreted in urine.
蛋白质消化所致的氨(主要的排泄物)被转化为尿素(urea)而从尿(urine)中排出。
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