Answer:
The changes that should be made to improve this summary of the paragraph’s central idea are:
* Remove the phrase "It is petrifying" because it expresses a personal feeling.
* Add the phrase "and spread throughout the human species" to the end of the statement to more fully express the central idea.
Step-by-step explanation:
The question is not complete since it does not provide the summary of reference. Here is the complete information:
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."
The use of the expression "It is petrifying" by being a personal opinion makes the summary bias and this can not be considered reliable information as it should be in a sentence that tries to simplify the objective information of a paragraph, and the sentence "and spread throughout the human species" will round the concept that wants to be conveyed towards the way cells act.