seaweed
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池の表面に緑色の藻が広がっていた。
Green algae had spread across the surface of the pond.
水槽の掃除をしないと藻が増えてしまう。
If you do not clean the tank, algae will increase.
藻の研究は環境保全にも役立つ。
Research on algae is also useful for environmental conservation.