What are the two types of digestive systems invertebrates may have?

• Correct Answer: gastric and monogastric
• complete and simple
• complete and fluid
• complete and incomplete

Explanation: Invertebrates have one of two types of digestive system. They are called incomplete and complete digestive systems. Both are shown in Figure below . An incomplete digestive system consists of a digestive cavity with one opening. The single opening serves as both mouth and anus. A complete digestive system consists of a digestive tract with two openings. One opening is the mouth. The other is the anus.

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