After a big change, ecosystems usually come back. Organisms may respond to change in one of three ways. Some organisms respond by adapting. Adapting means adjusting to a new habitat. Fireweed on Mt. St. Helens adapted by growing through the crust.
Some organisms perish.
Organisms that perish do not survive. A turtle may survive a fire. If it cannot meet its needs after the fire, it may not survive. Some organisms relocate. An organism that relocates finds a new home.