PLZ HELP Why do the people who live in the altiplanos have large chests and lungs?

They work very hard.
There is very little oxygen.
They have a disease.
The sun is too bright.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

the speech convinced americans that the ussr was an enemy, rather than an ally, which led to the creation of the truman doctrine.

governments establishing monopolies for business should be the correct answer.

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hope this : )