How do expressions such as "no cake walk" and "not for the faint-hearted" add meaning to the passage?
They mean that only people who love the desert can survive there.
They explain that maintaining a life in the desert is difficult.
They highlight the dangerous aspects of living in the desert.
They imply that life in the desert is simple and easy.
They explain why plants are unable to survive in a desert.
They show why many people choose to live in a desert atmosphere.