BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Yellow paloverde tree (Parkinsonia microphylla). Photosynthesis is carried out in the bark of this tree, rather than in the leaves. This adaptation enables it to survive drought conditions by allowing it to shed its leaves in hot periods. Photographed in the Organ Pipe Cactus National Monument, Arizona, USA.
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