Final answer:
Biodiversity refers to the variety of life on Earth, encompassing species, genetic, and ecosystem diversity, and is essential for the broad scope of biological science.
Step-by-step explanation:
The variety of life in the world or in a particular habitat or ecosystem is called biodiversity. Biodiversity includes species diversity, genetic diversity within species, and ecosystem diversity. Ecosystem diversity refers to the different kinds of ecosystems, such as coral reefs and prairies, that contribute to the overall diversity of life. Biological diversity is not only about the variety of living organisms but also encompasses the genetic differences among them and the communities and ecosystems in which they occur. The science of biology is broad due to the substantial biodiversity created through the process of evolution.