Jellyfish are, compared to mollusks, arthropods and vertebrates, very simple organisms. Jellyfish did not evolve a respiratory or an excretory system, as they can perform gas exchange at their outer surfaces.
the Excretory System gets rid of wastes the other body systems don't need
Because the other Organ systems help with important things, but the respiratory system is the most important because it is basically the breathing system. You need to breath to live, so, the respiratory system is the boss of all the other body systems.(Do not change this, it is the correct answer)
Cnidarians are able to absorb the oxygen they need from the surrounding water by diffusion.
Their cells are too close to the animal's exterior surface.
They dont need to eat
_ _ _ _
Without these systems, we wouldn't be able to breathe or to pump blood throughout our body. We need these systems in order to stay alive.
Plants do not need an excretory system because they create a very small amount of nitrogenous waste.
no definite
the digestive system digests foods wich are broken gown into things like glucose and the glucose is then circulated through the blood and to the muscular system which is the then used for aerobic respiration, for aerobic respiration you muscles need oxygen, the oxygen is carried to other parts of the body to certin cells, the cells give off carbon dioxide with is then take back to the lungs and the excretory system gets rid of the carbon dioxide. this is how they all work together.
There are many ailments of the excretory system, you need to be more specific
Made up of Body parts that help with the exchange of gases. Basically Well functioning organs and a airway