Butterflies of the genus colias live in the rocky mountains, where they experience a wide range of temperatures. different variants of a particular glycolytic enzyme in the flight muscles are optimall

Butterflies of the genus colias live in the rocky mountains, where they experience a wide range of temperatures. different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. within the same population, some individual butterflies fly most effectively at 29 c° , while others fly most effectively at 40°c. still others can be equally active at both temperatures.