| 1 | Constant mutation and adaptation are the survival mechanisms of pathogens. | |
| 2 | This is the full differential equation for the full mechanism. Not just one part of it. | |
| 3 | Similarly, there is no biological mechanism by which fear, by itself, can kill. | |
| 4 | So a complicated mechanism will basically put these three building blocks together in a series. | |
| 5 | Scientists have yet to pinpoint the mechanisms involved but have come up with several plausible explanations. |