Seed plants are a group of plants that reproduce using seeds, which are structures that contain the embryo of a new plant. This group includes two main categories: gymnosperms, which produce seeds that are not enclosed in an ovary, and angiosperms, which produce seeds within a fruit. Seed plants are essential for many ecosystems, providing food, shelter, and oxygen. These plants have specialized structures, such as roots, stems, and leaves, that help them grow and thrive in various environments. The seeds allow for greater survival and dispersal compared to non-seed plants, such as ferns and mosses, making seed plants a dominant group in many habitats.