सर्वयोनिषु कौन्तेय मूर्तयः सम्भवन्ति याः। तासां ब्रह्म महद्योनिरहं बीजप्रदः पिता ॥

sarva-yoniṣhu kaunteya mūrtayaḥ sambhavanti yāḥ tāsāṁ brahma mahad yonir ahaṁ bīja-pradaḥ pitā

In whatsoever wombs mortals are produced, O Kaunteya, the great Eternal is their womb, I their generating father.

In plain words: Krishna says that whatever form a living being is born in, nature is its mother and he is its father. Every creature comes from him.