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Thriving Stromatolite is one of the Missions in the first Episode of the game. After Phytoplankton and Zooplankton the Stromatolite is one of the early Organisms in the game. It grows in the Shallows of the warm sea and when certain conditions are met, it will develop further and evolve. In the mission Thriving Stromatolite, the player should read the game's journal or listen to/ask Navi to find out, what the Stromatolite will need to grow. A certain amount of Stromatolites is needed so they can evolve.
"Increase Stromatolite population to 1,000. They thrive in shallows at 48° C."