Certain Bacterial Photoautotrophs Use Bacteriochlorophyll for Photosynthesis

Certain bacterial photoautotrophs use bacteriochlorophyll for photosynthesis.Bacteriochlorophyll molecules absorb light of longer wavelengths than the chlorophyll a molecules of other photosynthesizing organisms.The longer wavelengths pass through other organisms.What is the ecological advantage to this?

A) Bacteria can grow below dense layers of algae, using light not absorbed by the algae.
B) Bacteria can grow beneath algae layers because short wavelengths passing through algae are converted to longer wavelengths.
C) Bacteria can grow above algae because absorption of long wavelengths helps algae, on which bacteria feed.
D) The long wavelengths are absorbed and used to produce bioluminescence.
E) There is no ecological advantage to absorbing light of a longer wavelength.

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