Those wastes are basically the extra fluids that are not useful, because the urpose of the excretory system is to regulate those and just keep the exact amount of water, salts, and nutrients.
However, the wastes produced by it may depend on which medium are they crossing, for example through skin we got sweat, or from the kidneys we got urine which is liquid, or from lungs we got carbon dioxide which is a gas. And obviously the solid waste is feces.
So excretory system is important in regulating fluids in the body and excreting out of the body in form of wastes because they are not useful.
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