We know habitats have changed many times over in most places. We have had several ice-ages, meteorite impacts, etc. Evolution doesnt save anything. You keep see`ing it as a force. Its more a result.If we dont even know its an event then we cant conclude that the habitat was actually even changed.So maybe at that point in time there was no need for evolution to be the thing that saved them.
Let me try simplify the concept.
You have 100 birds on an island. They all get a virus. All but perhaps 5 die. The offspring of those remaining birds will all be immune to the virus. Soon there will be 100 birds again, but all immune to a specific virus. On the island next door where the virus did not get to.... they have the same type of bird, except without the evolutionary change.
You have 100 birds on an island. They eat all the fruit. They start starving. Most of them die, a couple of others manage to survive by eating insects. Their offspring will more easily be able to eat insects and survive.
You have 100 birds on an island. Aliens come down and blow up most of the red and blue birds. A couple survive by hiding. The offspring of those hiders will be better able to survive a future with aliens as they inherited the ability to hide from aliens. Dude, even if aliens come down, evolution still plays its part
There is no magical force that comes downs and makes them all able to eat bugs or to be immune to that virus. Its those that survive whatever event are more likely to have offspring that are better able to survive that event.
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