input: [0] Platyhelminthes [1] None [2] None [3] Mouth, pharynx and a gastrovascular cavity [4] Regeneration, Hermaphroditic [5] flame cells [6] Ladder-like nervous system [8] Muscle cells [7] 
output: None
options: S k e l e t a l
options: S p i c u l e s
options: N o n e
options: S o m e c o n t a i n s h e l l s
options: E x o s k e l e t o n m a d e o f c h i t i n