Carbon bi oxide.
Carbon di Oxide is the metabolic waste excreted out from our body through mouth.
Carbon dioxide.
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The main waste excreted by the skin is heat.
Metabolic waste is made up of substances that the body cannot use for energy. It consists of urine and feces that are excreted, and carbon dioxide, which is exhaled through the nose and mouth.
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An annelid excretes solid waste through its anus. However, metabolic wastes are excreted by its nephridia, a pair of organs.
Your lungs wash out the carbon bi oxide. It is a metabolic waste of biological oxidation process.
All the general anesthetic agents absorbed through lungs are excreted through lungs only. Many heavy metals, rifampicin are excreted partially through skin. All the large drug molecules, not excreted by kidney are excreted by liver through bile.
Most of the metabolic waste is removed by the excretory system. This system comprises of kidneys, ureters, urinary bladder and urethra. Large molecules are excreted by your liver through biliary system. Your lungs excrete the carbon bi oxide and few other volatile drugs like used in anaesthesia. Then your skin excrete some toxic substances.