why are green algae not likely to be found in the deepest strata of the ocean?

Green alga require sunlight for carrying out photosynthesis. Deepest ocean has a very less amount of sunlight, as green alga lack the photosynthetic pigment  that can absorb shorter wavelength of light like phycoerythrin, they need longer wavelength of light for which they have to stay at the surface of ocean.

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