What is responsible for the unusual ecosystem of the highlands? humans and human movements
rivers and river movements
volcanoes and volcanic activity
animals and animal activity

(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.”)

5read the following sentence from kennedy's inaugural speech.and so, my fellow americans, ask not what your countfor you; ask what you can do for your country.ot what your country can dothis sentence is an example of an antimetabole, a rhetorical device in whichthe speaker reverses the order of repeated words. antimetabole is used toplace added emphasis on the final part of the statement. which of thefollowing is also an example of antimetabole? a"this nation, for all its hopes and boasts, will not be fully free until itscitizens are free." – john f. kennedy, 1963"forgive your enemies, but never forget their names."- john f. kennedy, quoted in 1984 by ed kochc"mankind must put an end to war, or war will put an end to mankind."- john f. kennedy, 1961d"a man may die, nations may rise and fall, but an idea lives on."- john f. kennedy, 1962

In which sentence does the underlined adverb modify a verb? (i’ll put the words that are underlined in caps) a. water young plants often. b. water young plants rather often. c. we generally water young plants often. d. water very young plants often.