Question

multiple choice question
incomplete digestive systems have one opening. digestion occurs in a

o cardiovascular cavity.
o gastrovascular cavity.
o oralvascular cavity.

Explanation:

Incomplete digestive systems, like in cnidarians, have a single opening (serves as both mouth and anus). Digestion occurs in the gastrovascular cavity. The cardiovascular cavity is related to the circulatory system (not digestion). "Oralvascular cavity" is not a standard biological term.

Answer:

gastrovascular cavity.