What happens when you get a brain concussion?

The instructions for making proteins come originally from

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?