Answer : 1. "Non-coding regions of DNA"
Explanation :

Using AI, researchers discovered potential cancer drivers in ‘junk’ DNA regions, which are non-coding segments of DNA. While DNA codes for proteins, not all sequences perform this function. Some non-coding DNA produces RNA components, but others have unknown functions and are called junk DNA. In humans, 98% of DNA is non-coding, while in bacteria it is 2%. Evidence suggests that junk DNA may have functional roles through exaptation, acquiring functions beyond natural selection.