Which of the following is not a type of trade barrier? a. a tariff b. a quota c. a patent d. an embargo

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?