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Marimo
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=== Shape === The round shape of the marimo is maintained by gentle wave action that occasionally turns it. The best environment for that are shallow lakes with sandy bottoms.<ref name="population-decline"/> The balls are green all the way round which guarantees that they can [[Photosynthesis|photosynthesize]] no matter which side is turned upwards. Inside, the ball is also green and packed with dormant [[chloroplast]]s which become active in a matter of hours if the ball breaks apart. The wave action also cleans the balls of [[detritus|dead organic material]]. As some colonies have two or even three layers of marimo balls, wave action is needed to tumble them around so each ball reaches the light. The spherical shape has a low [[surface-area-to-volume ratio]] compared to a [[leaf]], which limits [[photosynthesis]] and therefore limits the maximum size of the marimo balls.
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