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If you have ever flown across several time zones, you have experienced jet lag. You arrived in a new time zone, but your body was still living on the time in the old zone. You were wide awake and ready for dinner in the middle of the night, and you wanted to sleep all day.
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People suffer from jet lag because all living things have a biological clock. Plants and animals are all rhythm with the natural divisions of time-day and night and the seasons.
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At sunrise, plants open their leaves and begin producing food. At night, they rest. In¡¦(»ý·«)
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e birds migrate to a region with a warmer climate. Their biological clocks tell them it is time to do all of these things.
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Animals that live near the sea and depend on both the land and the water for their food have their biological clocks set with the tides. When the tide goes out, they know it is time to search for the food that the sea left behind it.
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Some insects seem to set their alarm clocks to wake them up at night. They are out all night looking for food and ten sleep during the day. Honeybees have a very strong sense of time. They can tell by the position of the sun exactly when their favorite flowers open.
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