Which health aspect is directly linked to biodiversity?

Higher food security is directly linked to biodiversity through the variety of species and genetic diversity within ecosystems. Biodiversity ensures a wide range of plants and animals can be cultivated for food, which contributes to a more resilient food system. When multiple crops or livestock species are available, it enhances food production stability and nutritional diversity. Diverse ecosystems are also better equipped to withstand diseases and pests, ensuring a more reliable food supply. This can lead to improved nutrition and health outcomes for populations relying on these resources, reinforcing the connection between biodiversity and food security.

The other options, while they may have indirect connections to biodiversity, do not reflect the direct linkages as clearly as food security does. For instance, increased physical fitness can be influenced by access to green spaces, but that is more about human activity than direct biodiversity per se. Better mental clarity and more recreational activities may also benefit from nature, but they arise from individual or community interactions with diverse ecosystems rather than being a core health outcome of biodiversity itself. Overall, higher food security stands out as the most direct health aspect linked to biodiversity.