Define biodiversity and explain its importance to ecosystem services.

• A. Biodiversity is the number of species that are endangered; only affects aesthetics.
• B. Biodiversity is the age of species in an area.
• C. Biodiversity is the variety of life in an area that supports ecosystem services like pollination, nutrient cycling, and resilience.
• D. Biodiversity is the total biomass in an area.

Answer: (C)

Biodiversity is the variety of life in a given area, including the range of species, genetic diversity within those species, and the variety of ecosystems present. This diversity underpins ecosystem services by enabling key processes such as pollination by a diversity of organisms, nutrient cycling and decomposition by microbes and other organisms, and resilience to disturbances like droughts, floods, or invasive species. When many different species and genetic resources are present, ecosystems can perform their roles more reliably; if one species declines, others can help maintain essential functions, keeping services like food production, clean water, climate regulation, and recreational or cultural value available.

The idea being tested is that biodiversity is about the variety of life that supports these services. Focusing only on endangered species and aesthetics overlooks the broad range of life and functions that ecosystems rely on. The age of species isn’t what biodiversity measures, and biomass reflects how much living matter exists, not how diverse the community is.