You find a worm and discover that it has no coelom, no nephridia and a mouth but no anus. What must be true of this animal? A. it is a xenacoelomorph B. it is s pseudocoelomate C. it is hermaphroditic D. it exhibits bilateral symmetry E. A, C and D

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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Q18

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**Question:**

You find a worm and discover that it has no coelom, no nephridia and a mouth but no anus. What must be true of this animal?

**Options:**

A. it is a xenacoelomorph  
B. it is a pseudocoelomate  
C. it is hermaphroditic  
D. it exhibits bilateral symmetry  
E. A, C and D  

**Answer Choices:**

- ○ D. it exhibits bilateral symmetry
- ○ A, C, & D.
- ○ E. A & C only
- ○ A. it is a xenacoelomorph
- ○ C. it is hermaphroditic
- ○ B. it is a pseudocoelomate

The diagram consists of multiple-choice options indicating possible characteristics of a specific worm. These characteristics relate to the worm's anatomy and classification within biological taxonomy.

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Transcribed Image Text:--- **Question:** You find a worm and discover that it has no coelom, no nephridia and a mouth but no anus. What must be true of this animal? **Options:** A. it is a xenacoelomorph B. it is a pseudocoelomate C. it is hermaphroditic D. it exhibits bilateral symmetry E. A, C and D **Answer Choices:** - ○ D. it exhibits bilateral symmetry - ○ A, C, & D. - ○ E. A & C only - ○ A. it is a xenacoelomorph - ○ C. it is hermaphroditic - ○ B. it is a pseudocoelomate The diagram consists of multiple-choice options indicating possible characteristics of a specific worm. These characteristics relate to the worm's anatomy and classification within biological taxonomy. ---
Expert Solution
Step 1

Xenacoelomorphs are invertebrate organisms that also lack true body cavities and are thus acoelomates which can be both parasitic and symbiotic. Morphologically they are very much related to flatworms.

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