The Clan of the Cave Bear

Question: Is the clan language American sign language, some other sign language or made up?

Chosen answer: Completely made up. It was too difficult to teach all the actors ASL.

Question: I understand that certain changes need to be made when adapting a book to the screen, but can anyone tell me the reason why they so radically changed an ending which would have worked fine as it was in the book?

Chosen answer: The only reason I (and anyone I asked) could find was that, as usual, they discarded the ending though emotionally intense for the sake of another climax full of physical violence after the belief that this is the type of endings people prefer in the movies. Really sad indeed.