1. What are the major types of terrestrial ecosystems? 2. What are the major types of marine ecosystems? 3. What are the major types of freshwater ecosystem? 4. What ecosystem services do mountains provide? 5. What causes biomes and ecosystems to be formed? 6. Define edge effect. 7. What key factors determine the types and numbers of organisms found at various depths in aquatic ecosystems? 8. How does ocean acidification threaten coral reefs? 9. Give examples of standing and flowing bodies of fresh water. 10. How do human activities degrade freshwater systems? 11. How do rivers affect the land they flow through? 12. Identify and describe a unique service provided by inland wetlands. 13. What is a biome? 14. What makes desert ecosystems fragile? 15. What factors determine where terrestrial organisms can live? please someone help me out