QUINCY RUSSELL, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY QUINCY RUSSELL, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY
Bristlecone pine tree. Researcher holding wood from a bristlecone pine tree (Pinus longaeva). Bristlecone pines are thought to be the oldest living organisms on Earth, with one tree found to be some 4700 years old. The trees only grow at high altitudes in the south-western USA. They grow very slowly due to the cold and dry soils. Photographed in the White Mountains, California, USA.
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