Why are small, geographically isolated populations at high risk for extinction?

Which of the following crops is not typically grown in the great plains region? a. corn c. soybeans b. rice d. wheat

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

In which horizon of soil profile is prevent material usually found