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The passage given below is followed by four alternative summaries. Choose the option that best captures the essence of the passage. The evolution of animal play—a seemingly costly, frivolous, and non-essential activity—presents an evolutionary puzzle because natural selection usually favors behaviors that offer direct survival advantages. Play consumes energy, exposes the animal to potential predators, and takes time away from crucial activities like foraging or mating. However, evidence suggests that play, particularly in juveniles, serves as 'insurance' for the animal's future: it allows them to safely rehearse essential motor skills, social behaviors, and cognitive flexibility needed for navigating unpredictable environments in adulthood. Therefore, evolution likely retained play not for immediate gain, but for the long-term benefit of fitness and adaptability.