Chemical warfare involves using gaseous, liquid, or solid substances to kill or incapacitate enemies or to poison their food and water. Biological warfare involves using disease-producing microbes whose multiplication in people, animals, or plants causes their death. The use of and the threat to use chemical and biological warfare have waxed and waned throughout human history, depending on specific political, religious, and ethical circumstances.
Ancient Period: To 500 c.e.
For thousands of years, humans, in conducting their wars, have used toxic chemicals and deadly...
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