Conservatives have more self-control

[Anomalocaris]

Biological Evolution has a role, in the sense that so long as biosphere exists for evolution to occur the process of evolution unavoidably interacts with, affects and is affected by other parts of the natural world.    It has no function in the sense that it fulfilled some intended role.

Biological evolution on earth could just as easily have led the biosphere of the earth down the path of total collapse right near the beginning, leaving it with no role to play during the subsequent evolution of earth the planet.