Why is the Hadean eon important? why is the archean eon important?
why is the proterozoic eon important?

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.

the answer is a) high entry costs

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.

1775 is your answer hope this