Immigration to the north provided workers for production and replacements for soldiers killed or wounded.
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WWI implemented trench warfare. Instead of everyone standing in a line people got down in trenches and fought each other. They would stay in these trenches for extended periods of time. The trenches were usually dirty and crowded.
Answer: Abundance of Soil Nutrients in the desert, home to diverse plants and animals that have adapted to survive the desert. Covers a 5th of the planet .
Explanation: