Krishna explicitly maps out the 'Cosmic Wheel' (Chakra) of existence, linking biology, meteorology, and human action into a single unbreakable chain. He begins with the physical: Living beings are born of and sustained by food (annād bhavanti bhūtāni). Food is produced by rain (parjanyād anna-sambhavaḥ). Rain is produced by the performance of sacrifice (yajñād bhavati parjanyo). And sacrifice is born from the execution of prescribed action/duty (yajñaḥ karma-samudbhavaḥ).