Question

How is the waste produced by human beings different from that produced by plants and animals?​

Answer 1

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1. Excretion is a process by which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin.
2. This is in contrast with secretion, where the substance may have specific tasks after leaving the cell.
3. Excretion is an essential process in all forms of life. For example, in mammals urine is expelled through the urethra, which is part of the excretory system.
4. In unicellular organisms, waste products are discharged directly through the surface of the cell.

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