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A young woman hears cicadas chirping outside of her window. the last time she heard this noise, she was a teenager in middle school (about 13 years ago). the fact that these insects emerge every 13 years is due to the fact that cicadas have _____ clocks.

User Uknight
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A young woman hears cicadas chirping outside of her window, the last time she heard this noise, she was a teenager in middle school (about 13 years ago). the fact that these insects emerge every 13 years is due to the fact that cicadas have annual clocks.
User El Peregrino
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