Which civilizations lived within the Aztec Empire before Europeans arrived in the Americas

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

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sorry if this doesn't

answer; ( elites );

how did lincoln attempt to peacefully resolve the question of whether to resupply fort sumter?

(a) by sending unarmed supply ships to the fort