$TREE A tree is a perennial plant with a long lifespan, characterized by a single, woody stem or trunk that supports a crown of branches and leaves. These vital organisms are fundamental to Earth's ecosystems, playing a critical role in producing oxygen through photosynthesis, which is essential for most life forms. Trees also sequester carbon dioxide, helping to mitigate climate change. Their extensive root systems stabilize soil, prevent erosion, and absorb water, which is then released into the atmosphere, influencing local climates and rainfall patterns. Beyond their ecological significance, trees provide food, shelter, and materials for countless species, including humans. They are symbols of strength, growth, and life, and their presence enriches both urban and natural landscapes.