Only the stratoshere contains enough air for living things to breathe. True Or False?

Only the stratosphere contains enough air for living things to breathe. True Or False?  

its true

answer; ///(b) i believe that the correct answer is it could cause droughts which would make forest fire more likely; /// plz check this answer first, good luck

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.