Sympatric speciation is: . 1. initiated by the appearance of a geographic barrier 2. the process by which most animal species have evolved especially 3. important in the evolution of island species 4. the appearance of a new species in the same area

What are the differences between differing map projections ?

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."

Technology has affected regional settlement patterns in what ways? choose all that apply. climatic improvement strategies have improved crop productivity. mechanized agricultural methods have improved agricultural productivity. participation in the global economy has increased urbanization. population shifts from urban to rural areas has increased as a result of petroleum production. settlement areas have increased as a result of improved water storage and delivery systems.