You just tell them that you don't know the answer.
Anatomy is the study of the structure and relationship between body parts. Physiology is the study of the function of body parts and the body as a whole.
Physical education is what is known as instruction in physical exercise, and or games, as for schools especially .
Methotrexate: a gold standard for treatment of rheumatoid arthritis
You just add the nutrition values by the level of servings.