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Select all of the following that describe cnidarian feeding and digestion. - Extracellular digestion occurs...

Select all of the following that describe cnidarian feeding and digestion.
- Extracellular digestion occurs in the gastrovascular cavity
- A complete digestive tract has two openings
- Mouth opens into gastrovascular cavity
- Phagocytic cells are absent
- Undigested particles are expelled by the gastrovascular cavity

Answer

  1. Extracellular digestion occurs in the gastrovascular cavity: True. Cnidarians have a gastrovascular cavity where extracellular digestion takes place.

  2. A complete digestive tract has two openings: False. Cnidarians do not have a complete digestive tract; they have a single opening that serves as both mouth and anus.

  3. Mouth opens into gastrovascular cavity: True. The mouth of cnidarians opens into the gastrovascular cavity.

  4. Phagocytic cells are absent: False. Phagocytic cells are present in cnidarians to help in digestion.

  5. Undigested particles are expelled by the gastrovascular cavity: True. Undigested particles are expelled through the mouth.

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