Final answer:
Radioactive tracers are crucial in medicine and biological research for tracking and diagnosing, although they must be handled with care due to potential hazards.
Step-by-step explanation:
Radioactive tracers are important tools in biological research and medicine. They allow us to follow reactions, track the distribution of substances, and diagnose and treat medical conditions due to their ability to emit detectable radiation. Despite their usefulness, it's important to note that radioactive substances can be hazardous if not handled properly. They are used in a variety of other applications, such as controlling pests, measuring engine wear, and analyzing geological formations around oil wells.