A: they have a sparse population
Answer:
Railroads
Explanation:
Unlike airplanes and other forms of road transportation that their routes can be altered, have shortcuts, and other routes, railroads are fixed to the ground during construction and hence cannot be altered, hence they operate on fixed routes. Also railroads operate on fixed schedules, except for cases of delays, which seldom happens.
Answer:The Columbian Exchange — the interchange of plants, animals, disease, and technology sparked by Columbus's voyages to the New World — marked a critical point in history. It allowed ecologies and cultures that had previously been separated by oceans to mix in new and unpredictable ways.
Explanation:
