Biodiversity is the variation of life forms within a given ecosystem, biome, or for the entire Earth. Biodiversity is often used as a measure of the health of biological systems. The biodiversity found on Earth today consists of many millions of distinct biological species, which is the product of nearly 3.5 billion years of evolution.
the term biodiversity is commonly used to refer to the variety of life on earth. it is the total mo. of species and the gentic variabilty within each species.UNEP(1992) defines biodiversity as the variety and variability.