4. How did the expansion of railroads impact the development of the United States? a.
It caused little change because of the growth of the steamboat.
b. It made prices of goods increase in order to pay for more rail lines.
C. It made shipping products to markets easier and prices decreased.
d. It caused people to move closer to manufacturing centers.

Which technological breakthrough of the 1950s revolutionized the way that americans kept up with news and world events? a) radio b) internet c) television d) motion pictures

For 50 pointsfredrika's science teacher asked her to bring in three abiotic items from her backyard ecosystem. which of the following groups of items should she bring? a. a lightning bug, a plug of grass, and a wormb. a smooth rock, some red dirt, and an empty bird's nestc. a ladybug, a spider, and some water from a mud puddled. a caterpillar, a pine cone, and a piece of a robin's egg

The form the boundary between north and south china. a. himalayan mountains c. change river b. xi river d. qinling shandi mountains