mutable

Capable of or tending to change in form or quality or nature.

“a mutable substance”

“mutable weather patterns”

Prone to frequent change; inconstant.

“the fickle and mutable nature of truth”

“the mutable ways of fortune”

Tending to undergo genetic mutuation.

“It is likely, too, that the chromosomes of all eubacteria are as mutable as that of E. coli”