Wouldn't it be all of them? They can all come into use at some point
So that railroad companies could build railroads, expanding travel across one's country.
Answer:
a
Explanation:
fossil fuels add CO2 to the air and is not good for the environment
Answer:
There were thousands of trappers looking for furs all through the Rocky Mountains and Canada. It took only about ten years for the animals to become scarce. Beaver, which had been hunted to make beaver hats were almost hunted to extinction and then fancy people in the east and Europe decided they wanted silk hats and the market for beaver died.
Explanation:
