Question

which human activity is most likely to cause desertification in grassland biomes? a. reforestation b. overgrazing by livestock c. controlled burns d. urban green space expansion

Explanation:

Overgrazing by livestock removes too much vegetation in grasslands. This exposes the soil, making it vulnerable to erosion. Loss of vegetation cover and soil degradation can lead to desertification. Reforestation helps in combating desertification, controlled burns are a management - tool and not a major cause of desertification, and urban green - space expansion is not related to grassland desertification.

Answer:

B. Overgrazing by livestock