Read the paragraph from the hot zone and the summary that follows it. once the cells in a biological machine stop working, it can never be started again. it goes into a cascade of decay, falling toward disorder and randomness. except in the case of viruses. they can turn off and go dead. then, if they come in contact with a living system, they switch on and multiply. the only thing that "lived" inside this monkey was the unknown agent, and it was dead, for the time being. it was not multiplying or doing anything, since the monkey's cells were dead. but if the agent touched living cells, nancy's cells, it would come alive and begin to amplify itself. in theory, it could amplify itself around the world in the human species. summary of central idea: it is petrifying that even if viruses are dead, they have the potential to “come alive.” which changes should be made to improve this summary of the paragraph’s central idea? check all that apply. remove the phrase “it is petrifying” because it expresses a personal feeling. include the detail that there was a dead virus living inside the monkey. remove the detail that viruses can come alive even if they are dead. add the phrase “and spread throughout the human species” to the end of the statement to more fully express the central idea add a personal opinion about what may happen if the virus does “come alive.” the answer is : add the phrase “and spread throughout the human species” to the end of the statement to more fully express the central idea. ,remove the phrase “it is petrifying” because it expresses a personal feeling.

A) Remove the phrase “It is petrifying” because it expresses a personal feeling and D) Add the phrase “and spread throughout the human species” to the end of the statement to more fully express the central idea.

Explanation: When writing a summary of the central idea of a text, we have to express the ideas in a brief and clear way, without including personal opinions or irrelevant details. In the given paragraph from "The Hot Zone" we can see that the main idea is that viruses can "come alive" even after death, and spread throughout the human species, so to improve the given summary we should remove the phrase “It is petrifying” because it expresses a personal feeling (and it is not objective) and also add the phrase “and spread throughout the human species” to the end of the statement because it is an important part of the main idea.

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.