TRUE or FALSE?
The following sentence uses all of the commas correctly:
For decades, the silliest, strangest theories as to the extinction of the dinosaurs have been that mammals reduced the dinosaur population by eating their eggs, that dinosaur bodies simply became too big to support their small brains, and that a devastating plant plague led to their starvation, but several Harvard scientists, in fact, believe that an asteroid from outside our solar system is really the root cause of their extinction.