I1N1T1R1O1G2R1E1S1S1I1O1N1
14 points
INTROGRESSION is validvalid
[n INTROGRESSIONS]
the modification of species by the backcrossing of the hybrids with the parent species [n -S]
[n INTROGRESSIONS]
the modification of species by the backcrossing of the hybrids with the parent species [n -S]