Ecological invasion refers to the process that people consciously or unconsciously bring some organisms into areas suitable for their habitat and reproduction, so that the biological population continues to expand and the distribution area continues to expand stably, thus endangering local production and life and changing local ecological environment.
According to the above definition, which of the followings belongs to ecological invasion?
American scientists have hybridized the wild soybean introduced from China with local varieties to cultivate an excellent variety resistant to soybean wilt. This variety has completely replaced the traditional soybean in the United States