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Which of the following is the most toxic excretory product(निम | NEET EXAM PDF

Which of the following is the most toxic excretory product(निम्नलिखित में से कौन सबसे विषैला उत्सर्जी उत्पाद है)
Anonymous Poll
10%
CO2
61%
Ammonia
21%
Urea
8%
Amino acid