Relatively few people live at high elevations, but there are significant exceptions, especially in

The formation of the isthmus of Panama, dividing the Pacific Ocean from the Caribbean Sea, resulted in many instances of

A. sympatric speciation. B. allopatric speciation. C. gene flow. D. polyploidy.

What are the two main ways that minerals are put together in rocks?

A. igneous versus sedimentary B. metamorphic versus sedimentary C. igneous versus metamorphic D. crystalline versus clastic

Between 1978 and 2015, the average number of children born to a woman in China declined from 3.0 to 1.7.

Answer the following statement true (T) or false (F)

In a dry climate with cold winters, this grain would least likely be cultivated

A) rice B) wheat C) barley D) oats E) jatropha