Index fossils are found a, in a very small geographic area.

b. in igneous rocks.

c. widely scattered in rocks over a large region.

d. widely scattered through many layers of rocks.

Explain the cause for movement river valley civilization to early industrial centers

People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.