1. Genetic diversity: This refers to the variation in genes within a species. It encompasses the range of different genes and alleles (alternative forms of genes) present within a population. Higher genetic diversity generally leads to a more resilient population, as it provides a wider range of traits that can be selected for in response to changing environments.

2. Species diversity: This refers to the variety of species in a given area. It encompasses both the number of different species (species richness) and their relative abundance (species evenness). A higher species diversity indicates a more complex and stable ecosystem.

3. Ecosystem diversity: This refers to the variety of ecosystems within a given area. It includes different habitats, communities, and ecological processes. A higher ecosystem diversity provides a wider range of resources and services, contributing to overall ecological stability and resilience.

These three levels of biological diversity are interconnected. For example, genetic diversity within a species contributes to its ability to adapt to changing environments, which in turn impacts species diversity. Similarly, species diversity influences the structure and function of ecosystems, which affects ecosystem diversity.