Answer:
The biological event that followed the Mount St. Helens eruption is called biological succession.
Explanation:
What happens in this process is that, once a biome, or a specific place gets destroyed, all this organic matter that it's left of it will be on the ground, and this can be the basis of another community that can grow exponentially in this place. Once the main events of the eruption pass, what happens is that, plants will start growing up again in some time, and this will happen until the point that this community gets to its climax again in some years.
