What do demographers and urban planners do

Demographers study population: migration, birth and aging/death.
urban planners study land for environments for population to see if the land is good enough for a community to build on, that water is safe and the air is clean enough.
they find areas fit for neighborhoods to be built and or cities. make sure everything is safe and the fight size in land.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

Answerbecause of improved transportation, communication, and other advantages;