Flatworms (Platyhelminthes)are _ and typically have .

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Flatworms (Platyhelminthes) are bilaterally symmetrical and typically have a gastrovascular cavity with one opening, meaning they have a digestive system, but it consists of a single opening where food enters and wastes are expelled. This system is also referred to as an incomplete digestive system. Option A is incorrect because while flatworms are bilaterally symmetrical, they do not have a complete digestive system with both a mouth and anus. Option C and D are incorrect because flatworms are not radially symmetrical and not all flatworms are parasites.

Flatworms (Platyhelminthes)are _ and Typically Have