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Check333, and did you manage to complete it without any losses? That's great, really great. For biologists, plants usually consist of 2-3 trees located somewhere on the edge of the forest, scattered in different parts of the map, both in the early and late game locations. Here, the task requires good attention to detail.
Rem137, regarding the archangels - yes, at least 3 mines and the remaining city development choices should also favor the Haven faction.
Regarding the dwarf - I'm not quite sure who you mean.