1. In all mammals except for humans physical and chemicaldigestion begins where? Why are humans the exception?
2. Write these in the order of innermost (touching digestingfood) to outermost (touching the inside of your body) and provide abrief description of each: connective tissue, epithelium, layer ofmuscle (thin), layer of muscle (thick) submucosa, subserosa,serosa
3. What are segmentation, peristalsis and reverse peristalsisand what is each used for in the body
