Wikipedia page about this book: https://en.wikipedia.org/wiki/Student_Body_(short_story)

Release date is 2010-03-29

Produced by Sankar Viswanathan, Robert Cicconetti, and the
Online Distributed Proofreading Team at http://www.pgdp.net

"Student Body" by F. L. Wallace is a science fiction short story published in 1953. When colonists land on the seemingly ideal planet Glade, they begin preparing to establish humanity's newest settlement. But biologist Dano Marin soon discovers something disturbing about the native lifeforms. The creatures possess an extraordinary ability to adapt and mutate at incredible speed, transforming in response to every threat the colonists introduce. As each countermeasure fails, Marin realizes the mutations are following a terrifying pattern toward an inevitable conclusion. (This is an automatically generated summary.)

Original publication data not identified