Answer: It indicates that wagon consisting the letter X is the last wagon of the train. It easily alerts the railway officials so that they can save from the accident.
Explanation:
Woodrow Wilson of America had been genuinely stunned by the savagery of WW1.
In America, there was a growing desire for the government to adopt a policy of isolation and leave Europe to its own devices. In failing health, Wilson wanted America to concentrate on itself and, despite developing the idea of a League of Nations, he wanted an American input into Europe to be kept to a minimum. He believed that Germany should be punished but in a way that would lead to European reconciliation as opposed to revenge.
Georges Clemenceau of France had one very simple belief - Germany should be brought to its knees so that she could never start a war again- also for revenge as Germany had attacked France a few times.
The British public was after revenge and Lloyd George's public image reflected this mood. "Hang the Kaiser" and "Make Germany Pay" were two very common calls in the era immediately after the end of the war and Lloyd George, looking for public support, echoed these views.
The Columbian Exchange greatly affected almost every society on earth, bringing destructive diseases that depopulated many cultures, and also circulating a wide variety of new crops and livestock that, in the long term, increased rather than diminished the world human population.
The answer I think is c. Studies show that they think the earliest the entered is about 33,000 years ago
