The first humans are thought to have lived in the open, grassy savannas of Africa. Think and explain how our body structure and behavior are adapted to provide life in the savannah.

How does the carbon cycle involve an exchange of carbon

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil