What is the 'catch-all' term for ocean life that includes photosynthetic, single-celled eukaryotes like diatoms but also multicellular organisms like nori seaweed and kelp?

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1. What is the 'catch-all' term for ocean life that includes photosynthetic, single-celled eukaryotes like diatoms but also multicellular organisms like nori seaweed and kelp?