Which of a planet's fundamental properties has the greatest effect on its level of volcanic and tectonic activity

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

How many structures do prokaryotic cells have in common with the eukaryotic cells? a. 2b. 3c. 4d. 5

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.