murtayah sambhavanti yah
tasam brahma mahad yonir
aham bija-pradah pita
It should be understood that all species of life, O son of Kunti, are made possible by birth in this material nature, and that I am the seed-giving father.
Commentary by Srila Prabhupada
In this verse it is clearly explained that the Supreme Personality of Godhead, Krishna, is the original father of all living entities. The living entities are combinations of the material nature and the spiritual nature. Such living entities are seen not only on this planet but on every planet, even on the highest, where Brahma is situated. Everywhere there are living entities; within the earth there are living entities, even within water and within fire. All these appearances are due to the mother, material nature, and Krishna’s seed-giving process. The purport is that the material world is impregnated with living entities, who come out in various forms at the time of creation according to their past deeds.
Commentary by Sri Visvanatha Cakravarti Thakur
Not only at the time of creation is prakrti the mother and I the father, but always.
Prakrti, mahad brahma, is the place of birth (yonih), the mother, of all those forms of moving and non-moving creatures which appear in all wombs from devas to grass, and I am the giver of the seed. I am the father, the giver of the seed, the giver of the jivas.