At one time, scientists proposed a principle called the central dogma. This principle stated that in the body, a chemical substance called DNA contains information. This information passes from DNA to RNA, but not from RNA to DNA. Then in 1970, scientists proved that some types of RNA can transfer information to DNA. What can you conclude from this information?

a. Scientists have made many life-saving discoveries.
b. Scientists work together to advance scientific knowledge.
c. Scientists often respond to what they see as needs in society.
d. Scientists may find new information that causes them to modify their ideas.