Which of the following is not a characteristic of homeostatic variables?

A) Their values can change.
B) They must remain within a narrow change.
C) They always remain at a fixed value.

Homeostatic Variables

Factors or conditions within the body that are maintained within a narrow range for the stability of the body's internal environment, including temperature, pH, and glucose levels.

Narrow Change

Refers to a minimal or slight alteration in a condition or value.

Fixed Value

A term that could refer to a constant number or setting in various contexts, but without a specific standard definition in this format, its meaning is ambiguous. Therefore, it could be considered not a universally recognized scientific term without additional context.