What is Bio warfare?

Bio War is the release toxins or pathogens into areas of land. People use bio weapons that deliver viruses and bacteria. Most would think it is expensive ,but Bio war is very cheap at $1 per square kilometer.

Who has used bio weapons?

Although America has made bio weapons, they haven't used them. The use of bio weapons is now illegal in America. One country that used bio weapons was Japan. The Japanese army spread deadly viruses into China.