Final answer:
Behavior does not have to be overt, as it can be covert and occur internally without direct observation. The option that is NOT a characteristic of behavior is d) Behavior is always overt.
Step-by-step explanation:
The question which of the following is NOT a characteristic of behavior? is addressing the concept of behavior in the context of biology. Answer d) Behavior is always overt is not a characteristic of behavior because behavior does not have to be overt.
It can also be covert, meaning it can occur internally and may not be directly observable, such as thinking or feeling. Behaviors indeed have dimensions (a), are lawful in that they follow rules or patterns (b), and can be observed, described, and recorded (c).