Temperature cause circadian clock to shift forward or backward, but cannot shorten or lengthen its 24-hour cycle. Research suggests this is because activity of genes and concentrations of proteins -- do not change with temperature, so the length of the cycle stays the same.

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Temperature cause circadian clock to shift forward or backward, but cannot shorten or lengthen its 24-hour cycle. Research suggests this is because activity of genes and concentrations of proteins -- do not change with temperature, so the length of the cycle stays the same.