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.
ययातिरुवाच मन्वेति तद् वै पुरुषेण सृष्टम्। स वै तस्या रज आपद्यते वै स गर्भभूतः समुपैति तत्र॥ वनस्पतीनोषधीश्चाविशन्ति अपो वायुं पृथिवीं चान्तरिक्षम्। मेवम्भूता गर्भभूता भवन्ति॥