In which mode(s) of transportation do companies often employ teams of two drivers, either in tandem or sequentially, to increase efficiency?
rail transportation
road transportation
water transportation
air transportation

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

Diego rivera was a famous artist from mexico. most of his paintings were murals. murals are paintings that are made directly on a wall. rivera thought that all people should be able to see beautiful art, not just people who could afford to go to museums. this is why he painted most of his murals on the walls of public buildings

Me ! select the correct answer. in his essay "civil disobedience," henry david thoreau wrote "that government is best which governs least." which answer best shows how this motto reflects transcendentalist principles? a. an ideal government does not exist, so anarchy is best for a nation. b. citizens require the government to define the difference between right and wrong. c. government can act as an impediment to the will and morality of individual men. d. an ideal nation is one that is not governed by a monarchy or dictatorship. e. government on a large scale is inefficient and should be managed at the state level.