The stomach is the only part of the alimentary canal with three muscular layers. Why does the stomach need three layers of muscle

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

yes we can.   a lady urinates from her urethra.