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The reverse of this is camels: they fitst evolved their adaptions to survive the cold, not the desert.
That isn't the reverse, it's the same deal - adaptations to one place turn out to be beneficial in another. Also, the desert IS cold at night, no?
Arctic deserts are also a thing (e.g. Iceland). The similarities tell the whole story:
- Poor access to liquid water
- Need to insulate body from temperature extremes, wind
- Food sources are sporadically available at best
- Need to minimize contact with ground or insulate feet
This is not to suggest that polar bears are similarly adapted to the Sahara. Rather, it's not a huge shift, but it's still a change.
in a similar vein rainforests do not have to be tropical, there are several temperate rainforests in europe of which the southwestern norwegian coast is apparently one
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