Final answer:
Purusha was sacrificed as part of a ritual to create the universe and all living beings, and his different body parts were transformed into different castes in Hindu mythology.
Step-by-step explanation:
In Hindu mythology, the sacrifice of Purusha is mentioned in the poem 'The Song of Purusha'. Purusha was sacrificed as part of a ritual to create the universe and all living beings. According to the myth, the different parts of Purusha's body were transformed into various elements of existence. For example, his mouth became the Brahmin caste, his arms became the Rajanya or Kshatriya caste, his thighs became the Vaisya caste, and his feet became the Sudra caste. This mythological sacrifice symbolizes the interconnectedness of all beings in Hindu philosophy.