Biodiversity can be defined as the variety of organisms at all levels: genetic variants of single individuals of a species (intraspecific diversity), differences between different species and taxonomic groups (interspecif diversity) and variety of ecosystems present in a specific territory (ecosystem diversity).
Up to now about two million species have been cataloged on earth, but naturalists estimate that the total number of species is at least ten million, three-quarters of which are concentrated in tropical rainforests.
Therefore, today only a fifth of the animal and plant species present on our planet are known.

