 Where did Mia grow up?
The ancient rule was sink or swim—swim in the miasma of a planet without spaceflight, or sink to utter destruction! We have a place in the Ship like that—the Third Level—but it's only a thousand square miles and any time it gets on your nerves you can go up a level or down a level and be back in civilization. When we turn fourteen, they drop us on the nearest colonized planet and come back one month later. I don't know how many of those planets had animals that could have been substituted but, even if they had, they would have had to be domesticated from scratch.
 a space ship
 Earth  a space ship  Tintera  The Third Level