Which sentence correctly uses commas to separate the nonessential element?
the james madison memorial building built in 1981, houses the folger shakespeare library.
the james madison memorial building, built in 1981, houses the folger shakespeare library.
the james madison memorial building, built in 1981 houses the folger shakespeare library.
the james madison memorial building built in 1981 houses the, folger shakespeare library.

What is the relationship between paragraph 2 paragraph 3 through 29?

(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.”)

As usual the nurse has trouble getting to the point what does juliet think happened before she learns the truth?