Sentences with phrase «of air bubbles developing»
Plants either dropped their leaves seasonally, shutting down the pathways that would normally carry water between roots and leaves; developed thinner water - conducting pathways, allowing them to keep their leaves while reducing the risk of air bubbles developing during freezing and thawing; or avoided the cold seasons altogether as herbs, losing aboveground stems and leaves and retreating as seeds, or storing organs underground, such as tulips or potatoes.
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The ice contains minute bubbles of prehistoric air trapped when it was formed, and once a reliable method had been developed by which to isolate and analyse that air (it is done in a vacuum), it was possible to get an idea of the composition of the atmosphere of the past, through ice - ages and interglacials.