Among the red,green and brown algae that inhabit the sea,which is likely to be found in the deepest waters?why?

Dear student,

Out of these algae, red algae is most likely to be found in deep water. 
This is because, in the visible spectrum, blue light has the smallest wavelength and penetrates the deepest. Whereas, red light has the largest wavelength and penetrates least.

Red algae can utilise the blue light and perform photosynthesis, and hence grow easily in depths. 

Regards

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