Members of the Phylum Platyhelminthes differ from animals belonging to Phylum Annelida and Phylum Arthropoda in:
 
1. having two germ layers instead of three
2. lacking a coelom
3. showing bioluminescence
4. having a complete digestive system
Subtopic:  Phylum Platyhelminthes |
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Level 2: 60%+
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