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How is the digestive system better then the respiratory system and the circulatory system?

I have a debate tomorrow. I already know that digestive system is not the most important in all systems but I have no choice. So can anyone give me ideas on what can I say to prove that the digestive system is more important than the circulatory system and respiratory system or prove how they are not important, thanks!

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Well it's a vise versa question neither can function without the rest. You could argue that the energy for the others to function comes from digestion. Theirs the whole enjoying the food you eat. The waste and by products from digestion are essential for other organisms to survive and thrive.

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U can't eat without it! And if u can't eat... How will people get fat???

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Ya but u can live without food for days but not without air
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True but I wouldn't say breathing is one of my hobbies :P
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Ask yourself what would happen if the digestive system failed.

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Strelok

The circulatory and respiratory systems are far more important than the digestive system. You can survive about a week without food, but not more than ten minutes without circulating blood or a way to breath oxygen.

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No one is more important then the other without the energy obtained from digestion your heart wouldn't have the energy to pump your blood and your diaphragm wouldn't be able to contract to allow you to breath.
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Strelok
But if you suddenly lost your digestive system you could live for a few days, without respiratory or circulatory less than five minutes.
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No, if you suddenly lost your digestive system that means you would suddenly have far too much blood for your body. Your blood pressure would sky rocket and your heart would explode. Just because in a survival situation you can live for a few weeks without food doesn't mean you can live without your digestive system.
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It's what's used to get food to your body. Food is the body's fuel, and without fuel the rest of those systems would shut down. It also removes the waste from body. Imagine if that didn't happen. You would explode.

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One is not better than the others. They're all necessary to live.

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