Which of the following best describes physiological variation in biology?

A.

Variations in the physiological processes and functions of organisms

B.

Differences in physical characteristics and appearance within a population

C.

Differences in behavior and social interactions among individuals

D.

Variations in the genetic makeup of individuals within a species

Correct answer is A

Physiological variation in biology refers to the variations in the physiological processes and functions of organisms. Physiological variation encompasses the variations in the internal processes and functions of organisms, including metabolic processes, hormone regulation, immune responses, cellular functions, and physiological adaptations.