A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga is most likely a type of ________.

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Red algae are known for their ability to absorb blue light and thrive in deep water environments. They are also often marine and multicellular, making them the best choice for this scenario. Brown and green algae may also be marine and multicellular, but they are not typically found at the depths only reached by blue light. Golden algae are primarily freshwater organisms.

A Biologist Discovers an Alga That Is Marine, Multicellular, and Lives