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Q: Why do Cnidaria not need respiratory or excretory systems?
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Why do cnidarians not need respiratory or excretory systems?

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.


How does the Excretory System work with other body systems to keep you alive?

the Excretory System gets rid of wastes the other body systems don't need


Do flatworms have a need for circulatory or respiratory systems?

no they dont


Why is the respiratory system act like a boss to other body systems?

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)


Flatworms have no need for circulatory and respiratory systems because?

Their cells are too close to the animal's exterior surface.


Why are the respiratory and circulatory system necessary for life?

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.


Why do people need the Excretory system?

_ _ _ _


Plants do not need an excretory system because they?

Plants do not need an excretory system because they create a very small amount of nitrogenous waste.


What does the digestive respiratory circulatory and excretory systems have in common?

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.


Why plants need and excretory system?

no definite


What is the meaning of each common ailment of the excretory system?

There are many ailments of the excretory system, you need to be more specific


What pair of body systems provide the raw materials that cells need for energy?

Nervous System, skeletal system, cardiovascular system, endocrine system