Final answer:
In sociology, the term used to describe the biological and physiological differences between males and females is 'sex'. This term is different from 'gender', which refers to societal roles and behaviors associated with being male or female.
Step-by-step explanation:
The term sociologists use to describe physical or physiological differences between males and females, including both primary sex characteristics (such as the reproductive system) and secondary characteristics (such as height and muscularity), is referred to as a person's sex. This concept is distinct from gender, which relates to the behaviors, personal traits, and social positions that society attributes to being male or female. Thus, the answer to the question would be D) Sex.