Which of the following best describes biodiversity loss?

Biodiversity loss refers to the decline in the variety and abundance of species and ecosystems within a given environment. This decline can arise from various factors including habitat destruction, climate change, pollution, overexploitation of resources, and invasive species, all of which contribute to a decrease in the number of different species and the health of ecosystems.

Answer B accurately describes this phenomenon, highlighting that biodiversity loss is marked by a decrease in both ecosystems and species. This loss affects ecological balance and can lead to negative consequences for environmental stability, human health, and the economy.

In contrast, other options do not appropriately reflect the concept of biodiversity loss. For instance, an increase in species variety would denote biodiversity gain rather than loss. Similarly, stating there is no change in species population does not capture the essence of biodiversity loss, which inherently involves a reduction in diversity. Promoting agricultural practices may sometimes lead to biodiversity loss, particularly if those practices result in habitat destruction or monocultures, but it is not inherently related to the concept of biodiversity loss itself.