Through agriculture using the Euphrates river
Because they found skulls in South Africa that was from ages ago{proof}
A nation's "sovereignty" allows it to exercise its political power and authority, since without sovereignty it is unlikely that the nation would be able to keep out outside powers and influence.
Answer:
It is suggesting an improved technology. A new fertilizer that grows bigger, faster, more crops than the old fertilizer did.
Explanation:
Since you have not presented any choices of diseases for the question, I'll just enumerate some conditions that would lead to damage of respiratory system. The conditions that are most likely to occur if the cilia in our respiratory system are:
-Smoker's cough
-Emphysema
-Lung cancer
-bronchitis
