The graph below is from an experiment where total light exposure was adjusted for three groups of rats. Each group had 12 rats and each group was exposed to different amounts of light versus dark in a 24-hour period for three months. Food consumption was measured in each group following each 24-hour period. Food pellets are reported as means per group for three months. (Note: All rats used in the experiment were the same age and breed. All were fed the same kind of food pellets.) What could you infer from the graph? (SC.912.N.1.1)
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Rats eat more when they are exposed to more light.
Rats eat more when they are exposed to higher temperatures.
Light schedules affect the appetites of rats.
The appetites of rats are unrelated to light schedule.