Which description applies to digestion in which food enters and waste leaves through the same opening?

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Multiple Choice

Which description applies to digestion in which food enters and waste leaves through the same opening?

Explanation:
Two-way digestion describes a system where a single opening serves as both mouth and anus. In this setup, food is taken in and digestion occurs in a gastrovascular cavity; enzymes break down the food inside, nutrients are absorbed by the lining, and undigested material is expelled back through the same opening. This type is typical of simpler animals like cnidarians and some flatworms. The other terms don’t fit: an alimentary canal is a digestive tube with two openings (mouth and anus) for one-way processing, while coelom and pseudocoelom refer to body cavities rather than how digestion opens to the outside.

Two-way digestion describes a system where a single opening serves as both mouth and anus. In this setup, food is taken in and digestion occurs in a gastrovascular cavity; enzymes break down the food inside, nutrients are absorbed by the lining, and undigested material is expelled back through the same opening. This type is typical of simpler animals like cnidarians and some flatworms. The other terms don’t fit: an alimentary canal is a digestive tube with two openings (mouth and anus) for one-way processing, while coelom and pseudocoelom refer to body cavities rather than how digestion opens to the outside.

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