However, a research framework based on creation of variation has yet to be found that allows one to determine whether the reason for sex is universal for all sexual species, and, if not, which mechanisms are acting in each species.
Con todo, aínda ten que encontrarse un marco de investigación que permita determinar se a razón para o sexo é universal para todas as especies e, se non o é, que mecanismo está actuando en cada especie.