Answer:
B. Allows for specialized regions with specialized functions
Explanation:
Where the complete digestive system has different specialized regions to perform specialized functions, the gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms).
An advantage of a complete digestive system over a gastrovascular cavity is that it allows for specialized regions with specialized functions.
This is defined as a structural adaptation of a body part to a distinct function.
The complete digestive system has different specialized regions with specialized functions which makes digestion more efficient.
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