مناسب جهت تقویت زبان انگلیسی1. What happens when one part ofan ecosystem changes?2. Why can’t trees grow insome grasslands?3. Lemmings are able to live onthe tundra. Why?4. You have readabout the importance of prairie dogsin their habitat. Write to explain thethings that prairie dogs do to helpkeep other living things alive.5. Main Idea and Details A tropicalforest is one kind of ecosystem. Listsome details from the book aboutthis forest.