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Nature is governed by an indispensable but fragile equilibrium between fauna and flora inhabiting the same space. This interdependence of billions of lives on Earth has maintained a natural order for thousands of years in spite of the great diversity of species and the complex unicity of each biotope. In ancient Chinese philosophy, Yin-Yang expresses all the concrete dualities of life: a set of opposite and complementing forces in the same universe, controlling the vitality of Nature and, paradoxically, forming one and same unit.

As a microcosm of Earth, the skin is an ecosystem affected by the symbiosis of relationships between the various communities inhabiting it, called the microbiota, and the natural mechanisms that ensure its physiological functions ... ... ...