Tree seedlings are young plants that develop from seeds. They are the initial stage in a tree's life cycle, emerging after a seed germinates. Seedlings typically have a small stem, a few leaves, and a root system that helps them absorb water and nutrients from the soil. These young trees play a crucial role in the environment by contributing to biodiversity and providing habitats for various wildlife. As they grow, seedlings can eventually develop into mature trees, which help improve air quality and provide shade, making them essential for healthy ecosystems.