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Most of the plant's solid matter is obtained from the atmosphere. Through a process called photosynthesis, plants use energy from the sun to convert carbon dioxide from the atmosphere into simple sugars. These sugars are used as building materials and constitute the main structural components of the plant. Plants depend mainly on soil for supporting and obtaining water, as well as important basic nutrients such as nitrogen and phosphorus. Most plants need to be able to grow successfully, as well as oxygen in the atmosphere (for breathing) and around the roots. However, some special vascular plants such as mangroves can allow their roots to grow in a anoxic environment.