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Q: What is the disadvantage of having one opening into the digestive cavity?
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What are the disadvantages of a flatworm's digestive system having only one opening?

They cannot eat continuously (there mouth and anus are present in the same opening)


Which organism uses the same opening for ingestion and egestion?

Organisms that have only one opening in their digestive tract through which food enters and waste exits are known as having an incomplete digestive system. Some organisms with incomplete digestive systems are jellyfish, sea anemones, flatworms, and corals.


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What are the significance of an animal's having two separate opening to the digestive tract as seen in Ascaris?

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