A category within biology that deals with the physical and chemical functions.

a. Physiology

b. Philosophy

c. Psychology

d. Physiopathology

The answer is a. Physiology. Physiology is a category within biology that deals with the chemical and physical functions. It studies the functions in living systems. Physiology studies the chemical and physical functions on different levels of biological organization, such as organisms, organ systems, organs, cells, and molecules.