A researcher illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He found that the largest groups were found in the areas illuminated by the red and blue light. What can you conclude about the bacteria that congregated in areas other than red and blue light? Some bacteria have different forms of chlorophyll, which allows them to absorb different wavelengths of light.

Excess carbon dioxide in these areas attracted bacteria that complete anaerobic respiration.

Bacteria congregated in these areas because they contained carbon dioxide released by the algae.

Light of different wavelengths can be absorbed by aerobic bacteria but not by anaerobic bacteria.