Bob, Rob, Tod, Ana, Anna, and Hannah are trapped in a cave, which is a common habitat for rats and bats, but for bad luck, there's also a grizzly bear, one of the many rat predators that exist
it's daytime, and because of that the bear has awaken, people and rats run away with fear, but unfortunaly, because of genetic variation, some rats, Bob, and Ana are more visible in the cave's darkness, and the bear is now hunting them as preys
Fortunaly, Hannah have survived even with her unfavorable phenotype, white skin. Now because of the decrease of rat population in the cave, and their adaptation of the dark, bats have more bugs to eat, causing them to reproduce more
Hannah starved to death because of the lack in food and difficulty to hunt, the bear has awaken again but fortunaly he can't see the rats nor the people
Hannah and Rob are the only people left and the bear has died, a albino rat has born, and Rob, which is a evolutionist, says it is a genetic mutation caused by luck in the descendant offsprings. Because of the bear's death and the incredibly visible rat, they would survive a bit more
Hannah and Rob can't live in the cave, but rats and bats have evolve to do it, they both can find bugs for food by diferent ways, but without a predator, both species will eventually suffer overpopulation and will slowly lack food
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