appleontree

有两句话，用分号隔开
#1：In California, a lack of genetic variation in the Argentine ant

has allowed the species to spread widely;

#2：because it is so genetically similar, the ant considers all its

fellows to be close relatives and thus does not engage in the kind

of fierce intercolony struggles that limits

limits是that定语从句的谓语，该从句的主语为the kind of fierce

intercolony struggles，是单数