Biological Time Measurement
Man is clearly able to sense time, sometimes quite accurately. For example, most of us are able to wake up at the same time of day with a little practice. One wonders whether plants and other animals also have the ability to measure time. Regular patterns of migration or flowering might lead one to suspect that this is the case (daylength could be measured to detect season), but on the other hand, occurrences that take place at a given time of year might be responses to changes in temperature or some other climatic factor.
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