All of the big five extinctions occurred during the: a) hadean eon b)archean eon c) protozoic eon d) phanerozoic eon

Which statements describe characteristics of mdcs? higher standard of living increased agricultural focus more access to health care more access to transportation and communication more industry reduced educational opportunities shorter life expectancy

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

Which layer surrounds the center of the earth? a: crust b: core c: mantle