The ice caps are melting due to global warming which is being affected by the polluted air
Development of more railroad systems contributed
most to US westward expansion in the second half of the nineteenth century.
The correct answer between all the choices given is the second choice or
letter B. I am hoping that this answer has satisfied your query and it will be
able to help you in your endeavor, and if you would like, feel free to ask
another question.
When you are in danger in unknown territory, for example you’re flying a plane and you don’t know where you are doing and get lost. The flight controller may be able to find your location and save you.
