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A tree is a perennial woody plant characterized by a single main stem or trunk, supporting branches and leaves. Typically reaching significant heights, trees play a vital ecological role by producing oxygen, stabilizing soil, and providing habitats for wildlife. Their structure includes roots for nutrient absorption, a trunk for support and nutrient transport, and a crown for photosynthesis. Trees can be deciduous (shedding leaves seasonally) or evergreen (retaining leaves year-round). They vary widely in size, shape, and longevity, with some species living for thousands of years. Economically, trees supply timber, fruit, and other resources, while culturally, they symbolize growth, resilience, and connection to nature.