On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1
earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting
the snow and ice at the top of the volcano and creating volcanic mudflows. Which type of change was seen in the ecosystem
around Mount St. Helens after it erupted?
primary succession
secondary succession
a climax community
species extinction

Primary succession

Explanation:
1- Primary Succession means occurring OVER TIME. It is the gradual growth of an ecosystem over a longer period of time.

2- Secondary Succession is a process started by an event that reduces an already established ecosystem to a SMALLER POPULATION of species, and as such secondary succession occurs on preexisting soil.

3- Climax Community is when the development of vegetation in an area over time, have reached a STEADY STATE. The climax community is composed of species best adapted to average conditions in that area.

4- Species Extinction is self explanatory, species there die off probably never to be seen again.

They became more resistant.