New and Used American Eagle RVs For Sale. Current American Eagle inventory - find local, new and used listings from private RV owners and dealers. American Coach American Eagle (79)
Definition of evolve for English Language Learners. : to change or develop slowly often into a better, more complex, or more advanced state : to develop by a process of evolution.
Adaptation is the evolutionary process whereby a population becomes  better suited to its habitat.    The word adaptation comes from the root word adapt and means to â¦  change in a way that is beneficial to survival.