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Solution
The correct option is B <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Urea Urea is formed when proteins are broken down. Accumulation of urea is harmful to the body. So itt is removed by the kidneys. Carbon dioxide is a respiratory waste. Undigested food is eliminated by the digestive system. Oxygen is essential for the body for the break down of food in the cells.