A high lying plane. India: deccan plateau
<span>provide a guide to proper ethical and moral behavior. </span>
<span>The Hundred Years' War was a conflict between </span>England and France which was caused from a territorial dispute. Hope this helps.
The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
