A digestive tract is complete if it

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A complete digestive tract refers to a one-way tube with a mouth and an anus, where food enters through the mouth and waste products are eliminated through the anus. This is in contrast to an incomplete digestive tract, where the same opening is used for both ingestion and egestion. Possessing specialized regions for different digestive tasks (A), producing acids and enzymes (B), and being surrounded by muscle (D) are important features of a complete digestive tract, but the defining characteristic is the presence of a separate mouth and anus.

A Digestive Tract Is Complete If It