After the last major ice age, sea levels around the world rose. as they did, the rising waters divided what was once a single island in the north sea into two different islands. a population of rabbits was split between the two islands. ten thousand years passed with no contact between the two rabbit groups. in recent times, a scientist attempted to breed individuals from the two groups, but he was unsuccessful in doing so. why were rabbits from the two groups unable to produce offspring together?