Which of the following is correct?
a. north africa relies on tourism
b. north africa has struggled with civil war.
c. north africa is facing desertification.
d. all of the above

In a scientific experiment, a is any factor that can be changed or be changed

What is an example of a line segment

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