Kidneys and lungs excrete a variety of substances. state two reasons why these substances are excreted
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Your lungs excrete carbon dioxide as you breathe out, your kidneys filter out nasties to produce urine, removing nitrogen waste from your body, and your skin sheds excess salt through sweat. All vertebrate animals produce nitrogen waste in one form or another.
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because, nitrogenous wastes are hormful for living organisms like urea, carbon dioxide etc
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