algae are often restricted to the top 100 meters of the ocean
ocean_zone is water. pacific_ocean is 100_water. find_underwater is algae. multicellular_algae is algae. algae is aquatic_organism. abyssal_zone is ocean_stratification_zone. ecosystem_extreme is ecosystem. ocean_zone is ocean_stratification_zone. ocean_stratification_zone is water. unicellular_algae is algae.