Final answer:
Natiri's mother tells Jake that the Sky People can't learn Na'vi ways because of cultural differences.
Step-by-step explanation:
Natiri's mother tells Jake that the Sky People can't learn Na'vi ways because of cultural differences. The Na'vi have a unique way of life and a deep connection with their environment, which the Sky People, representing humanity, do not understand or appreciate. The Sky People have different values and priorities, which clash with the Na'vi's way of life. This creates a barrier that prevents the Sky People from fully embracing and learning the Na'vi ways.