مناسب جهت تقویت زبان انگلیسی

1. What happens when one part of

an ecosystem changes?

2. Why can’t trees grow in

some grasslands?

3. Lemmings are able to live on

the tundra. Why?

4. You have read

about the importance of prairie dogs

in their habitat. Write to explain the

things that prairie dogs do to help

keep other living things alive.

5. Main Idea and Details A tropical

forest is one kind of ecosystem. List

some details from the book about

this forest.