Which most devastating disease wiped out more than one third of the population all the way from china to western europe?
a. cholera
b. influenza
c. the black plague
d. typhoid

by improved communication.

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.

that would be the steamboat because none of the other things are forms of transportation

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slaves and scribes

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