The question of minimum population sizes for different levels of technology is tricky. One has the whole of Earth researching and developing clever hacks to help keep things simple on Mars. I expect a lot of clever dodges making it possible to obtain adequate outcomes on Mars without needing a deep technology stack and a large population.
The mention of "water purification control chips" reminded me of Poland using clams for this: https://www.johnfhuntwater.co.uk/resources/news/how-clams-keep-water-clean-in-poland/
The question of minimum population sizes for different levels of technology is tricky. One has the whole of Earth researching and developing clever hacks to help keep things simple on Mars. I expect a lot of clever dodges making it possible to obtain adequate outcomes on Mars without needing a deep technology stack and a large population.
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