So Arjuna is asking this question, prakṛtiṁ puruṣaṁ caiva: "Kindly give me instruction about this prakṛti and puruṣa." Kṣetram. Kṣetram means the field of activity, and kṣetrajñam. Kṣetrajñam means one who knows, "This is my field." Just like the cultivator, he cultivates the land. From government there is demarcation of the land. The cultivator knows, "This is my portion of land." Similarly, every one of us, we are cultivating and we are given a field. This is the body. The spirit soul is the owner of the body or the occupier of the body. Actually, he's not the owner. That will be explained by Kṛṣṇa. Idaṁ śarīraṁ kaunteya kṣetram ity abhidhīyate (BG 13.2). "This body, my dear Arjuna, is called kṣetra." Kṣetra means the field of activities.
I am a human being. Because I have got this body, I am acting in a different way than the cats and dogs, because he has got a different type of body. His field of activities is different; my field of activity is different. So according to the body we are acting. Idaṁ śarīraṁ kṣetram. And there are eight million four hundred thousand types of bodies. Jalajā nava lakṣāṇi sthavarā lakṣa-viṁśati kṛmayo rudra-saṅkhyakaḥ. Not one type of body. Nine hundred thousand forms of body in the water, jalajā nava-lakṣāṇi.