Our World 4. UNIT 6 Review

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2. It is an area different from the areas around it. It has different characteristics or people use it for different purposes. What is it?

A. a zone

3. It is a very large sea creature. It breathes air through a hole at the tops of its head. What is it?

A. a whale

4. It is the process of making air, water or soil dirty. It is bad for human, animals and plants. What is it?

A. Pollution

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