Continue adding new species to your volcanic island until you have a successful ecosystem. Drag and drop the species in order to how they invade the volcanic island.

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Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.