6)Why do the walls of the stomach secrete hydrochloric acid? 7)Which TWO parts of the alimentary canal make up the small intestine?

1.The enzyme pepsin.Pepsin breaks down proteins in the stomach

2 Im pretty sure its the duodenum and the ileum

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

hope this .

coal is not sustainable because it will one day run out.