a) all languages are complex systems which are equally valid as means of communication
b) each language meets the communicative needs of its speakers in an entirely adequate way
c) if needs change; then the language changes with them
d) there is no such thing as a "primitive" language
e) Languages spoken in communities not as technologically advanced as opurs are linguistically no different.
f) Language spoken by isolated hilll-tribes in Papua, say, are in every way as ordered and complex as English.