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1. Douglas fir trees have cells. All living things have one or more cells. 2. Douglas fir trees obtain and use energy. Douglas fir trees are plants and have the ability to use sunlight energy. They use the energy of the sun and take in carbon dioxide from the air through their leaves. They use water. From the sunlight, carbon dioxide and water, Douglas fir trees make simple sugars. They use the simple sugars to live and grow.