Famous and Classic Science Fiction NovelThey weren't human. They were somethingmore—and something less—they were,in short, humanity's hopes for survival!
Lester del Rey was an American science fiction author and editor. Del Rey is especially famous for his juvenile novels such as those which are part of the Winston Science Fiction series, and for Del Rey Books, the fantasy and science fiction branch of Ballantine Books edited by Lester del Rey and his fourth wife Judy-Lynn del Rey.
Actually the “germ plasm” is affected by changes to the organism i.e. there is a sine qua non relationship between genetics and physiology… The last sentence of this story is truly hair raisingly terrifying!