What is the defining characteristic of an actogram?

An actogram is specifically designed to represent the daily activity patterns of an organism, typically over a period of several days or weeks. It visually displays the rhythmic patterns of activity and rest that show how an organism's behavior varies throughout the day, highlighting aspects such as periods of activity and inactivity. This data can reveal crucial information about the timing of behaviors, such as feeding, mating, or sleeping, as well as the overall circadian rhythms that regulate these activities.

While seasonal changes, water uptake, and nutrient absorption are important biological concepts, they fall outside the scope of what an actogram specifically measures and depicts. An actogram focuses solely on the cyclical patterns of behavior rather than on these other physiological processes. This makes the option related to daily activity patterns the unique defining characteristic.