evolutionary rate; rate of evolution
Technical term used in biology and related fields to describe the speed at which evolutionary change occurs.
The evolutionary rate of this species is very slow.
The rate of evolution is influenced by environmental changes.
進化 means 'evolution' in general, while 進化速度 specifically refers to the speed or rate of that process.
速度 is a general term for 'speed' or 'velocity'; 進化速度 narrows it to the context of evolution.
Compound of 進化 (しんか, 'evolution') and 速度 (そくど, 'speed'). The word is a straightforward technical term with no irregular historical derivation.