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Q: Why do very simple animals not need a digestive tract or respiratory system?
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Related questions

What two body systems does the pharynx belong to?

The Digestive system, and the Respiratory system.


Is esophagus part of the respiratory system?

No. The esophagus is part of the digestive system. The pharynx is part of both the digestive and respiratory systems.


What is the chamber shared by the digestive and respiratory system?

Pharynx is the region shared by both the digestive and the respiratory system.


How does the respiratory system deal with the digestive system?

Good respiratory system imoroves digestive system. People who does pranayama will know the results


How does the respiratory help the digestive system?

Respiratory system provides O2 to digestive system which is essential for all cells and their working .


How does the digestive system respiratory respiratory system urinary system and reproductive system linked?

its not


Which organ system contains the intestines?

intestines: Digestive system lungs: Respiratory system


What is the relation between the digestive system and the respiratory system?

the digestive system is obliviously for breaking and digesting food whereas the respiratory system is for breathing


Does the respiratory system work with digestive system?

no


What is one reason the respiratory system is important to the digestive system?

The Circulatory System pumps blood and the Respiratory and Digestive System carry it though your body.


Is digestive system related to lungs?

No. Your Lungs are part of your respiratory system, not you digestive system


Are the teeth an important part of the respiratory system?

No, but the digestive system is ( Brittany gatcomb) :)