Question

what is the major concern regarding loss of biodiversity in agriculture?
loss of genetic diversity
improved soil fertility
decrease in crop yield
increase in wildlife

Explanation:

Biodiversity loss in agriculture, especially genetic diversity, is a major concern. Loss of genetic diversity (e.g., from monocultures) reduces resilience to pests, diseases, and environmental changes. Improved soil fertility is positive, not a concern. Decrease in crop yield can result from biodiversity loss but the core concern is genetic diversity loss. Increase in wildlife isn't a major concern of biodiversity loss in agriculture.

Answer:

loss of genetic diversity