What should be understood as biological diversity? What is its value?

Biological diversity consists of genetic, species and ecosystem diversity.
Genetic diversity is the diversity of the genotypes of individuals that make up a species. The richer it is, the more fully the habitat resources are used, species exist for a long time and sustainably.
Species diversity is the diversity of species within a biocenosis, the basis of its stability. Due to species diversity, the extinction of a species does not affect the functioning of the ecosystem, since another species close in ecological needs occupies an ecological niche.
Ecosystem diversity is the diversity of species. All ecosystems of land and ocean are closely interconnected by the circulation of substances. A change in one ecosystem leads to a change in another. Diversity of ecosystems is the basis of the integrity and sustainability of the biosphere.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.