1. nonliving abiotic 2. major ecological grouping of plants and animals biome 3. living ecological niche 4. the interacting populations within a geographic area biotic 5. the basic relationships that show how a community of plants, animals, and bacteria live and grow and how these living things are dependent on each other as well as the Sun, soil, and other nonliving parts of their environment; a cycle of relationships ecosystem 6. the role or position of an organism in an ecosystem community