Because technology and weapons have become so advanced, most people agree that if this war ever happens, nuclear, biological and chemical weapons may be used. "Biological weapons" are living things, usually bacteria or viruses. "Chemical weapons" might not kill quickly, but poison people or their land. Together, nuclear, biological and chemical weapons are called weapons of mass destruction. Conventional weapons, on the other hand, are "normal" ones, like guns or non-nuclear bombs. 