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Circadian rhythms are _____. patterns that repeat themselves on a twice daily schedule physical and mental changes associated with the cycle of the moon rhythmical processes in your brain biological changes that occur on a 24-hour cycle

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Circadian rhythms are biological changes that occur on a 24 hour cycle. The correct option among all the options that are given in the question is the last option or the fourth option. This is the type of system that happens in plants, animals, cyanobacteria and fungi. I hope the answer comes to your help.