Answer:
The muscularis externa layer
Explanation:
The muscularis externa layer has three layers of muscle. An innner oblique layer , a middle circular and an external longitudinal layer. The contraction of these muscle layers help to break up the food mechanically.
Formulary would be a correct answer
1.firefighter 2.plumber 3. Electrician
4. Gardner 5.welder 6.pipe fitter 7.Mason
8. Fencer 9.blacksmith 10. Makeup artist 11.seamstress 12.painter 13.drafter 14.surveyor
15.butcher 16. Pastry chef