Final answer:
The question relates to the structure of the respiratory system, specifically the upper airway, which classifies it as anatomy. The correct answer is A) Anatomy.
Step-by-step explanation:
The statement 'The upper airway begins in the nose and the mouth' is describing the physical structure of the respiratory system, hence it pertains to anatomy. Anatomy is the branch of biology that deals with the structure of organisms and their parts. Therefore, the correct answer to the question is A) Anatomy. Physiology, on the other hand, would refer to the functions of these structures and how they work.