The excretory system is basically the system that deals with what the body releases. That doesn't just mean "poo" and "pee." It can also mean sweat. But what this system does for animals is that it basically gets rid of wastes and toxins. Without this system, all animals would probably die from poison and stuff like that. Humans throw up. That's also a part of the excretory system (I think), because vomiting gets rid of stuff the body considers dangerous.
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Like most animals, the pig has an excretory system. The primary function of this system is to remove waste from the pig.
your excretory system i think?
The urinary system is composed of the kidneys, urethra, bladder. This system excretes urine by filtering the blood circulating around the body by the kidneys and transfered to the urethra and bladder. The excretory system is composed of the urinary system and other different body organs. The skin, which composes the largest part of our body, is an excretory organ, it excretes sweat to regulate the body heat. The anus, excretes the solid wastes that are digested after food consumption. There are other body organs belonging to the excretory system, but these are only a few examples with their funciton.
One reason a transport system is necessary in animals because they need to get rid of the extra waste. They also need a transport system to take in nutrients.
They have muscular and excretory systems. The muscular system allows them to move from place to place over solid surfaces. The excretory system lets them maintain a proper balance of water and salts.