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Marimo weed is an algae that forms into a ball and floats in water. Th reason it floats is because the ball is filled with oxygen.
oxygen is the gas that is produced by the marimo weed balls :)
oxygen
because of the density of oxygen.
The cast of Eri ni kubittake - 2000 includes: Yumi Higashino as Marimo Tsuyoshi Miura as Guri Hideo Tsubota as Nick