Chemical weapons
Both sides developed lethal forms of chemical welfare that resulted to death of thousands in the trench war.Germany was the first to employ chemical weapons and it is estimated that over 10,000 tonnes of chemical gas, lethal and poisonous was blown.
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part 1: humans need guidance
part 2: prevent government abuse
Answer you're looking for is A. Disease epidemics during peacetime have resulted in more deaths than history's major wars
