Why are there fewer phytoplankton in the mesopelagic zone relative to the epipelagic zone?
lower light levels
lower oxygen levels
lower nutrient levels
lower water temperature

There werefewer phytoplankton in the mesopelagic zone relative to the epipelagic zone because of lower light levels.

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.