•How did the railroad, highway systems and airplanes effect where cities
developed?

Answertaurus is the highest in the sky;

5×^2+20-15 or -(5x^2-20+15)

The answer to the first one is barometer.

Unique question.well, using science, you cannot create or destroy even if you do eat yourself so you would not grow twice as big, nor would you disappear. you would stay the same but change states potentially, or at least change your appearance (obviously).hope this . keep up these unique questions.