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Plants coming back to life after 400 years frozen under glacier
These plants, known as bryophytes, are regenerating and their cells have totipotency, that is any tiny fragment of these plants can regrow the entire plant. They do not have a vascular system and so don't pump fluids, which helps them survive in times of extreme cold.

The team found that mosses and liverworts covered by ice over 400 years ago and now exposed due to glacial melting, are able to start growing again.

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Centuries-Old Plants Buried by a Glacier Brought Back to Life
This discovery dispels "the common belief that land exposed by melting glaciers is populated by new plant growth, exclusively via seeds or spores carried by the wind." Green terrestrial algae and cyanobacteria have also been discovered, lying frozen beneath the glaciers and springing back to life when conditions allow. The discovery of the bacteria shows that plants are not the only thing that can survive being frozen for 400 years.