The saxophone solo is an example of which prominent feature of jazz?

Improvisation.

The saxophone is an instrument that identifies the melodic and romantic characteristic of Jazz, however, in some cases this instrument is the representation of the moving in this rhythm, and moving is another strong characteristic of jazz.
The musical identity of jazz is complex and cannot be easily delimited, but without a doubt, improvisation is one of the defining characteristics of jazz.However, a jazz soloist-who performs piece by piece of jazz with an instrumentalist with or without accompaniment-must know in depth the language of jazz and its different dialects: traditional jazz, swing, bebop, hard bop and the rhythmic and harmonic innovations that They took place later.