Incredible footage shows plants 'breathing'

Scientists have released up-close footage that shows plants "breathing."

This video shows the stomata opening and closing in a manner that resembles a human mouth opening and closing.

The clip was recorded by the University of California San Diego during research funded by the US National Science Foundation.

It demonstrates that plants open and close their stomata in response to varying carbon dioxide levels, information that could have a significant impact on farming.

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