The Bible gives us a clear account of the land-dwelling, air-breathing animals’ survival. Clean animals came in sevens, unclean animals in pairs. In the terms of population genetics, this is termed a bottleneck. A bottleneck is any sharp drop in population size, which is often associated with a roughly equivalent loss in genetic diversity. According to the evolutionists, this catastrophic drop in genetic diversity should cause all of life to go extinct, or, at minimum, have basically no genetic diversity. . But does it actually work that way? Turns out, the answer is no.