Among hundreds of millions of races in Pan Gu world, the humankind had a top-grade fertility. The humankind had powerful bloodlines, strong bodies, and in every thirteen to fourteen years, a new generation could be born. In a hundred years, a human being could have multiple generations of descendants. In this way, the humankind rose, grew stronger and stronger.
However, among all races in Pan Gu world, the ones possessing the greatest fertility were these aquatic creatures, who seemed to be so insignificant. A fish or a shrimp could give birth to hundreds of thousands, and even millions of eggs. Only if even one or two in ten-thousand of these eggs could successfully hatch and grow up, the reproduction rate of these creatures would be far higher than the reproduction rate of human beings.