Circadian rhythms
are believed to
have originated in
the earliest cells,
with the purpose
of protecting
replicating
DNA from
high ultraviolet
radiation during
the daytime. As a
result, replication
was relegated to
the dark, and a basic pattern of day/night cycle was engrained
within the cell and passed down to subsequent generations. At
some time in the distant past, the days may have been longer,
because when we are deprived of time clues, we gravitate toward
a 25-hour circadian cycle.
Circadian rhythms
are believed to
have originated in
the earliest cells,
with the purpose
of protecting
replicating
DNA from
high ultraviolet
radiation during
the daytime. As a
result, replication
was relegated to
the dark, and a basic pattern of day/night cycle was engrained
within the cell and passed down to subsequent generations. At
some time in the distant past, the days may have been longer,
because when we are deprived of time clues, we gravitate toward
a 25-hour circadian cycle.
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