A Primary Source Is like a letter signed by George Washington, Like something that experienced the event, But a secondary source is like a textbook explaining the events of World War 2
Answer:
World Health Organization
Explanation:
World Health Organization is concerned with the statistic.
The biggest is food. Also when people are sick there is no healing stuff.
Because of the flooding from the tigris river. it deposited silt onto the land that made crops grow, then made the civilizations develop faster.
