Read the two passages from “Cool Jobs Part 1.” Passage 1: Forensic scientists use science to solve crimes. And researchers at labs around the world are developing new techniques to do this. Gilbert’s team, for instance, is investigating how microbial signatures might identify suspects. Another research group is working on a way to identify people from proteins found in a tiny strand of hair. And yet another scientist is studying the microbes that gather on a person’s body after death. Passage 2: [Gilbert’s] group has staged dozens of burglaries—so far, in Illinois, New York, and Florida. They are trying to prove that they can find burglars’ microbial fingerprints under different conditions. These include different types of homes and different seasons. The scientists are also asking people from various backgrounds to pose as burglars. What idea connects these two passages?

1. Forensic scientists work constantly and thoroughly to achieve accurate results.

2. Forensic scientists compete with each other to see who can come up with solutions first.

3. Forensic scientists stage crime scenes because they cannot handle the unpleasantness of reality.

4. Forensic scientists prefer not to work together to achieve the results they need.