What is the difference between a physical and a political map

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

How did the europeans design the national borders of africa? why?

Distance that the transcontinental railroad covered from omaha to san francisco.