Well, we grow the fish, fish help to fertilize, the bird eats the fish, and we eat the bird. Then it starts over and repeats itself. We also eat the fish. Then we all die and go back into the earth and help to enrich the soil. Everything is a never-ending cycle!
Is true. In nature nothing is created nor destroyed, but everything evolves. Even the birds evolved from reptiles, which evolved from fish, which evolved from... Simply put, I believe that we descended from the primordial amoeba. That's why we have so many flaws... at least I, I have so many flaws.