Otani says that "The evolution of isect is very fast. It is adaptable to the environment quikly. When we use agricultural chemicals, new one that is not killed appears. This vitality energy is due to not being big. It is sure that human can't do."
One insect is very weak, but the history of it is far longer than other creatures. The life of one insect is very short. This make species be able to exist for a long time. For example, cockroach have existed from the Paleozic. There are a lot of kind of them all over the world. And Mr.Otani says that " If nuclear war was happened and this influence the earth same as small planet attack the earth. Human can survive? I can't help expecting that there are only insects in the earth like in the Paleozoic."
Human have great intelligence , but insects are more great than us in vitarity force. In the future , insect may be host of