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A scientist said there is
to show early humans slowed down their
. This was so they could survive longer in
without food. However, humans could not do this like a bear. Bears can wake up after
of sleeping and their body will be the
as before they went into hibernation. The bones showed hibernation caused early humans health
. Many of these were because of a
of vitamin D, which we get from sunlight. This makes our bones
. The scientist said: "We have to emphasise that
are not always
."
