co·ev·o·lu·tion 
(kō′ĕv-ə-lshən, -ē-və-)
(kō′ĕv-ə-lshən, -ē-və-)n.
The process by which two or more interacting species evolve together, each changing as a result of changes in the other or others. It occurs, for example, between predators and prey and between insects and the flowers that they pollinate.
co′ev·o·lution·ar·y adj.
co′e·volve (-ĭ-vŏlv) v.