What happens to the density of air as altitude decreases? A. the density of air decreases
B. the density of air stays the same
c. the density of air changes randomly
D. the density of air increases

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

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation

All of the following are possible solutions that may be used to address agricultural issues in the future except decrease biodiversitydecrease pesticide usedevelop "cleaner" pesticidesincrease organic farming