Yayati said : All beings, thus fallen from heaven, become subtle substance, living in water. This water subsequently becomes the semen from which life is created. It then enters the womb of a woman in her season and develops into the embryo. It then becomes visible life like the fruit from the flower. Entering into trees, plants, vegetables, water, air, earth and space, the watery seed of life becomes quadrupeds of bipeds. This is the case with all creatures.