The Red Queen Hypothesis
In some evolutionary relationships, organisms must keep changing to maintain their position.
The Mechanism: The Red Queen hypothesis describes situations, especially host-parasite interactions, where opposing organisms continually adapt to one another. Each side's change can make the other's earlier advantage less effective.
The Philosophical Pivot: Evolution does not always move toward a final improvement. A population may change simply to remain viable in a shifting relationship, like running to stay in place.
The Horizon: This idea helps explain why diversity and variation can matter even when no organism appears to gain lasting superiority. It is not a universal account of all evolution or every competitive system.
The metaphor can illuminate arms races in biology, but it should not be casually used to claim that all life is locked in endless competition. Cooperation and stable ecological relations also shape evolution.
A change can be necessary without being progress toward a single destination.
Sometimes evolution changes the players only so they can remain in the game.
Where do I call constant adaptation progress when it may only be the cost of keeping up with a system that never stands still?