What is meant by biodiversity in an ecosystem?

Biodiversity in an ecosystem refers to the variety of life forms that exist within that specific habitat. This includes the diversity of species, genetic variations within those species, and the ecosystems themselves. A rich biodiversity is crucial for the resilience and stability of ecosystems, as it allows for a variety of interactions and processes that contribute to the overall health of the environment.

In this context, the first choice captures the essence of biodiversity by highlighting not just the number of different species present, but also the unique qualities and roles they play within their habitat. Biodiversity is important for functions such as pollination, nutrient cycling, and habitat formation, all of which contribute to a balanced ecosystem.

The other options, while related to ecological concepts, do not encapsulate the full scope of biodiversity. For example, the number of individuals of a species pertains to population dynamics rather than the overall variety of life. Total biomass focuses more on the quantity of living material in an area and overlooks the diversity aspect. Finally, interactions between different species describe ecological relationships but do not define the variety of life itself.