[Solved] What is the mean square for the main effect of factor B (MS<sub>B</sub>)? A) 27.50 B) 66.28 C) 58.73 D) 44.05 Physical: Relating to the body as opposed to the mind or emotions, or being in a material state. Occult Blood: Blood that is not visible to the naked eye, often detected in stool or urine samples through laboratory tests. Peristalsis: The series of wave-like muscle contractions that moves food through the digestive tract. Irritable Bowel Syndrome: A chronic gastrointestinal disorder characterized by abdominal pain, bloating, and alteration of bowel habits without any organic cause.