Amerchant would like to accurately count the number of items he buys and sells over the course of a week. which incan advancement would have the most use for him?

a. trephination
b. a quipu
c. a terrace
d. a chaski

Where did the domestication of crops and animals begin?

On the graph, the bottom horizontal line represents

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.