Which of the following regions can be classified as a functional region?

Answer 1

1. Silicon Valley in California, known for its concentration of tech companies and innovation.

2. The Rust Belt in the United States, known for its history of manufacturing and industry.

3. The Amazon rainforest in South America, known for its diverse ecosystem and importance to global climate regulation.

4. The European Union, a political and economic union of European countries.

5. The Great Barrier Reef in Australia, known for its unique marine biodiversity and importance to the local tourism industry.