What is the subject in the sentence.
The dogs bark as the mail carrier delivered the packages.

1)what was the first thing that cast doubt on the authenticity of the king being peter wilks's english brother? a)his refusal to answer questionsb)his arrival in town in a canoec)his illiteracy and inability to writed)his lack of knowledge about the wilks family 2)how did huck escape the clutches of the angry townspeople? a)he told them where the gold was. b)he ran off while digging up the body. c)his captor released him while running to see the gold. d)his captor sent him away because he did not want to share the gold.

This is the noun or pronoun to which a pronoun refers.

(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.”)