What is the definition of functional region

What examples can you give from the video that show how mexico city residents are adapting to water scarcity

Suggest 3 different reasons why there is an ageing population in the uk .

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire