"Crucifixus Etiam" by Walter M. Miller Jr is the final story, and a case of leaving the best until last.
Manue Nanti is a Peruvian manual worker in a work team terraforming Mars. His high-altitude physiology needs less expensive support to breathe the thin Martian atmosphere, but this results in irreversible biological changes that make a return to earth at the expiry of his five year contract unlikely.
If there's such a thing as ⬇️
The book as a whole is varied and generally of an above average standard. The clunkers were a lesser offering from H.G. Wells, and one by John Collier that was both the wrong kind of humour for me, and too far over the racist line for me to make allowances for its age. These two aside, excellent stuff 4⭐ 2mo