I1N1T1R1O1G2R1E1S1S1I1O1N1
14 points
INTROGRESSION is validvalid
the modification of species by the backcrossing of the hybrids with the parent species
the modification of species by the backcrossing of the hybrids with the parent species
the modification of species by the backcrossing of the hybrids with the parent species
the modification of species by the backcrossing of the hybrids with the parent species