There are fewer phytoplanktons in the mesopelagic zone because of LOWER LIGHT LEVELS. It is the area of the ocean that is just below the epipelagic zone. This area of the ocean extends from a depth of 200 to 1000 meters.
Fermentation occurs in anaerobic respiration, and produces less energy than in aerobic respiration due to the lack of ETC because oxygen is not present.
He's actually a biologist who specializes in organic chemistry. But since that's not in the answer choices, i'd recommend putting Scientist or Dermatologist.
