Answer:
In case Earth becomes uninhabitable.
Explanation:
If for whatever reason we are forced to leave Earth there are no other hospitable planets we could live on. By making mars more like Earth we could eventually relocate to mars.
Answer:
affected I believe is the answer
Explanation:
Maybe it's because not everyone can cope with each other after such a long time. Maybe not everyone has great social skills after living together for awhile.
