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

B. Built on drained and filled lake beds.

Mexico city was built on drained and filled lake beds. The following reasons were the motivations for altering the lake beds and draining it in order to build a city.

1. To reduce the risk of flooding.

2. To protect the city from being invaded.

3. To prevent diseases from spreading.

4. In order to mine the gold under these lake beds