To construct the transcontinental railroad, the Central Pacific and Union Pacific railroad companies built tracks O that started in the East and ran all the way to the West. O from the West Coast that wound around the mountains. O with one starting from the East and one starting from the West, meeting at a midway point. O from the West Coast that connected the South with the West.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.

southern north america: yucatán peninsula in southern mexico extending into northern guatemala, and northern belize. these moist forests on the yucatán peninsula of south-eastern mexico are characterized by a tropical humid climate with little topographic relief.

explanation: