All the natural environments and life forms (plants, animals, fungi, bacteria, etc.), as well as all the relationships and interactions that exist, on the one hand, between the living organisms themselves, and on the other, between these organisms and their living environments.
All the components and variations of the living world, as well as all their interactions. Scientists distinguish three levels of organization:
- ecological diversity (ecosystems) ;
- specific diversity (species) ;
- genetic diversity (genes).