I recently came across this short video which explains how healthy cells in the body repair damaged DNA, why damaged DNA can develop into breast cancer and how one common treatment for breast cancer works. It's pretty interesting:
Aside from the medical aspects of the video, the clip raises an important philosophical question. How do you suppose the repair mechanism ever arose?
Presumably it didn't exist early on in the evolutionary history of life, but if it didn't it's hard to see how the first cells would've survived given the frequency with which DNA is damaged. And if it did come to exist roughly at the same time as cells came to be, how did such a complex function, requiring specific protein shapes, ever emerge so rapidly in the early history of life?
Could blind, purposeless processes just by accident have created such a system? Which do you think is the more likely scenario, that random chance could've engineered the DNA repair system or that such complex systems were engineered by an intelligent engineer?