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Q.
The most abundant, harmful and universal waste product of metabolism is
UP CPMTUP CPMT 2004Excretory Products and their Elimination
Solution:
Carbon dioxide is the most abundant and universal waste product of most of the living organisms as $CO_2$ is the end product of respiration. The nutrients are burnt either in the presence or absence of $O_2$ to release energy in association with $CO_2 + H_2O$.