Here's why:
* Single-celled organisms (like bacteria and amoeba) lack specialized organs. They directly excrete waste products into their surroundings through diffusion.
* Multicellular organisms have developed complex systems for excretion. These systems include:
* Kidneys: Responsible for filtering waste products from the blood and producing urine.
* Lungs: Excrete carbon dioxide, a waste product of respiration.
* Skin: Excretes sweat, which contains salts and other waste products.
* Liver: Filters and detoxifies harmful substances from the blood, producing bile for excretion.
* Intestines: Excrete undigested food and other waste products.
Therefore, multicellular organisms, with their specialized organs, are better equipped for efficient excretion of metabolic wastes compared to single-celled organisms.
