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Photoperiodism
Beginning of paper
Plants and animals in the temperate zones respond in different ways to
the amount of daylight in 24-hour periods. This response to day length is
called photo periodism. It controls many activities, among them is the
flowering of plants. The ability to respond to day length is linked to an
inner, light-sensitive circadian rhythm.
In .... Middle of paper
.... them to periods of artificial light.
Some scientists are not certain that the biological clock of any
organism is completely endogenous. They think that even under the most
constant of laboratory conditions living things are aware of the Earth's
rotation and that this has an effect on the wheelof their clocks. However,
many scientists believe that such factors are not essential to the
functioning of biological clocks.
Word Count: 276
....
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Number of words: 260
Number of pages: 1 (approx. 250 words per double-spaced page)
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