The Evolutionary Mystery of Blood Types: A Hidden Advantage?

The human body is a miraculous thing. Millennia of evolution: random mutations, trial, and error have resulted in what we are today.

Evolution isn’t a straightforward process, however. There are still a lot of things about the human body we don’t understand. We have features and quirks that don’t always seem to have an obvious purpose or make sense.

Take for example blood types. Why did humans evolve to have separate blood types? Are they of any use? Or are they just an evolutionary throwback?