Which layer of the alimentary canal is constructed from either stratified squamous or simple columnar epithelium? a) muscularis externab) mucosac) submucosad) serosa

It is it B because a mucosa         B.B.    

lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?