Which mode of transportation has the disadvantage of operating on fixed routes and on a fixed schedule?

Railroads

Explanation: Railroad is a means of transportation used for conveying passengers and goods from one place to another. Rail transport adopt a fixed and standard steel tracks. Trains cannot move on any surface other than these steel tracks. While other means of transportation such as road transport can move on most flat surfaces, Trains follow the directional alignment or positioning of the steel tracks. Railroads as with some other means of transport such as air transport move on fixed schedules where passengers make bookings, board at designated locations and alight at specific stations.

the first question's answer is a.

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.