Final answer:
Soil degradation is the primary cause of vegetation loss in regions like Africa and Asia.
Explanation:
Soil degradation is the best explanation for areas without vegetation in various regions of Africa and Asia. High levels of desertification have led to degraded soils, making it difficult for vegetation to thrive. Unsustainable agricultural practices, including overgrazing and excessive tilling, have contributed to the loss of vegetation cover and fertility in these regions.
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