GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Oak leaves on a twig. The oak tree (Quercus robur) is a deciduous tree (a tree that loses its leaves in the autumn). The leaves contain the green pigment chlorophyll that is used to trap the energy of sunlight during photosynthesis. A network of veins carries water and nutrients in and out of the leaves.
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