Which term describes a digestive system with a single opening that serves as both mouth and anus?

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Multiple Choice

Which term describes a digestive system with a single opening that serves as both mouth and anus?

Explanation:
Two-way digestion describes a digestive arrangement where a single opening functions as both mouth and anus. In animals with this setup, digestion occurs in a gastrovascular cavity, so food enters the cavity, enzymes break it down, nutrients are absorbed, and waste exits through the same opening. There isn’t a separate digestive tube with two openings, which is why this term best fits the description. An alimentary canal, by contrast, is a tube with two openings. Endoderm and ectoderm are germ layers involved in development, not structures of the digestive system.

Two-way digestion describes a digestive arrangement where a single opening functions as both mouth and anus. In animals with this setup, digestion occurs in a gastrovascular cavity, so food enters the cavity, enzymes break it down, nutrients are absorbed, and waste exits through the same opening. There isn’t a separate digestive tube with two openings, which is why this term best fits the description.

An alimentary canal, by contrast, is a tube with two openings. Endoderm and ectoderm are germ layers involved in development, not structures of the digestive system.

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