When a population gets as low as 30, the population loses its genetic diversity. The next generation is weak. Usually the population heads off to extinction.
The creationists insist that Noah’s ark reduced the population of each species to two. Further that pair had to make a stressful journey back to its native land. I could not be eaten. It had to find suitable food en route. All species would have gone extinct. They didn’t, therefore the Noah myth cannot be true. It is a creationist lie. Further, it takes about 600,000 years to recover genetic diversity.~ Roedy (1948-02-04 age:70)