This is incorrect, although it is a common misconception. There is no varying degrees of evolution, and no one group can be more "evolved" than any other, because evolution has no goal. There is no target and no "ladder of evolution." Evolution isn't a heirarchy. There is just adaptation to local conditions. Those adaptions endow different groups with different features and characteristics, but that, again, is just differences.
Yep, clarified in post 447. Relative to environment.