An organism's activity levels often change at regular intervals called biological rhythms. The graph below represents the activity level of a population of small organisms found on an isolated island in a temperate zone: All of the following factors could cause this pattern of animal activity except the animals are ectotherms, so they are able to be most active during warm temperatures the animal's prey is nocturnal, so the population has adapted to be active when their prey is available their mating rituals and other social behavior involve visual displays that are best seen in daylight their predators are most active at dawn and dusk, and they have adapted to avoid the predators