Help me to note on excretion
Biology
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Excretion is the process by which metabolic waste products and other non-useful materials are eliminated from an organism. These waste products can be toxic if they accumulate.
In humans, the primary excretory organs are the kidneys, which filter blood to remove urea, excess salts, and water, forming urine. Other excretory organs include the lungs (removing carbon dioxide), the skin (removing sweat containing salts and urea), and the liver (detoxifying blood and producing urea).
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