Simply put, life "emerged" from dead chemicals - all by itself.
Fancier words noadays but do you think that's new?
I have reminded people countless times in countless forums but here I go again.
There is no CLEAR difference between "living" matter and "dead". It is the same matter. What we call "life" is something of an abstract idea. We think we know it when we see it and that it is clearly different from what is not "living". But exactly where this point is.
Is life defined by the complexity of the chemistry?
By the ability to replicate themselves?
By the ability to have more than one process occurring at a time? By having DNA? RNA?
Is life defined by the ability to evolve?
The ability to respond to an environment?
When you think you have answers to all these test your assumptions against complex "non-living" biochemicals and very simple "living" organisms.
(Harvard is probably about 5 years ahead of schedule)