Just try to understand in this way. God is the supreme father, and this material nature is the mother. The father... As this father injects the seed of living being within the womb of the mother, similarly, God injects the living being within this material world, and they come out under different forms with a material body. That varieties of material bodies are eight million four hundred thousands of species. As we get according... Yathā yoni yathā bījam. As we are getting life here according to the father's semina and mother's secretion, the body and situation... Somebody is very highly intelligent. Somebody is not so intelligent. Somebody is very rich. Somebody is poor. Somebody is middle class. Somebody is animal. Somebody is tree. Somebody is insect. Somebody is aquatic. Varieties of life.
Don't think that the animals or living entities other than the human being, they have no soul. No. That's a wrong conception. They have got souls. How you can say there is no soul. The same symptoms of life there.
Just like the symptoms of life means it takes birth at a certain date, then it grows, it stays, it gives some byproducts, then dwindles, then vanishes. Take any. Either you take tree or you take a human body, or you take an animal body or if you take an insect body, or take the demigod's body—any body you take, there is a certain date of birth, everyone, certain date of birth. And then there is a certain duration of life. Somebody lives for ten years. Somebody lives for one year. Somebody lives for six hours, five hours. There are many germs. They live for five hours, six hours, or even less than that. And there are living entities like Brahmā, whose life is millions and millions of years.