Rhythm of natural phenomenon is equal to rhythm of life phenomenon. Both have a circadian rhythm with a fluctuation characteristic of 1 / f [Pα f ⁿ (n = -1)]. In other words, life genes on the earth are all oriented toward circadian rhythm and 1 / f fluctuation..
Tropical rainforest is the environment that most realizes this state on the earth. Human genes are programmed to fit in this environment. That is, human genes are evolving to fit the tropical rainforest environment. Normaly it seems to be difficult to describe what the concrete image of "natural" or "life" in general is. But if you can say nature is tropical rainforest itself or to say life is toropical rainforest itself, it should be easy to describe what nature is. So we can say that "nature" or “life” is "tropical rain forest"itself. Life is the system in which the rainforest is embodied. We can paraphraised this way.