What are the 4 layers of the alimentary canal?

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Tags

1. #submucosa
2. #walls
3. #serosa
4. #tunics
5. #crucial
6. #canal
7. #externa
8. #contains
9. #basic
10. #plays
11. #known
12. #breakdown
13. #tissue
14. #certain
15. #layer
16. #alimentary
17. #mucosa
18. #layers
19. #musclaris