Which statement about the layers of the alimentary canal is correct? A. The serosa absorbs the products of digestion. B. The mucosa protects against self-digestion. C. The sub-mucosa is involved in segmentation and peristalsis D. The muscularis externa is dense connective tissue.
Option B. The mucosa (now no longer serosa) absorbs the product of digestion; the muscularis externa reasons segmentation & peristalsis; the sub- mucosa (now no longer muscularis) is dense connective tissue. so, the correct statement is The mucosa protects against self - digestion.
