What are the meterials needed to be removed from our body
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This is the job of the excretory system. You remove waste as a gas (carbon dioxide), as a liquid (urine and sweat), and as a solid. Excretion is the process of removing wastes and excess water from the body. Recall that carbon dioxide travels through the blood and is transferred to the lungs where it is exhaled.
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1. The water that circulates around the body needs to be removed periodically to flush out the toxins.
2. The air we breathe in contains gases like Carbon di-oxide, Nitrogen etc which are not needed and is removed.
3. The solid parts of the food that we eat, which is not required by the body is also excreted
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