What is an Adaptation?

1.Adaptation is the action or process of adapting or being adapted.
2. a movie, television drama, or stage play that has been adapted from a written work, typically a novel.
3. a change or the process  of change by which an organism or species becomes better suited to its environment.
Hope I helped! :P

Ithink the answer is fusion 

Inelastic is the answer your looking for.