Final answer:
The reliance of organisms on multiple environmental cues to determine circadian rhythms is known as entrainment.
Step-by-step explanation:
The reliance of organisms on multiple environmental cues to determine circadian rhythms is known as entrainment. Circadian rhythms are regular changes in biology or behavior that occur in a 24-hour cycle. These rhythms are controlled by a biological clock located in the brain, which sends signals to the body and causes regular changes in behavior and body processes.