1. Genetic Diversity: This refers to the variation in genes within a species. For example, different breeds of dogs all belong to the same species (Canis lupus familiaris), but they have a wide range of genetic variations that give them different physical characteristics and temperaments.

2. Species Diversity: This refers to the variety of different species in a particular area. For example, a rainforest has a much higher species diversity than a desert.

3. Ecosystem Diversity: This refers to the variety of different ecosystems within a region. For example, a region might have forests, grasslands, wetlands, and deserts, each with its own unique set of species and habitats.

It's important to note that all three levels of biodiversity are interconnected. Changes in one level can affect the others. For example, a loss of genetic diversity within a species can make it more vulnerable to disease or environmental change, which can then lead to a decline in species diversity.