21. The photic driving response elicited by a flash light in the visual cortex is also suppressed by nitrazepam. 22. The study also found statistically significant correlations between photic sneezing and the presence of a deviated nasal septum. 23. The surface zone contains ocean water that is in contact with the atmosphere and within the photic zone. 24. The stratum of the water column up till which sunlight penetrates is referred to as the photic zone. 25. The lower photic zone is high in nutrient concentration, low in light intensity and penetration and relatively cool. 26. Oceanic foams have also been suggested, using microscopic bubbles suspended in the upper layers of the photic zone. 27. Further studies have found that echolocation below the photic zone could have been a predation adaptation to diel migrating cephalopods. 28. They also lack symbiotic algae, generally living below the photic zone, and do not produce any strontium sulphate. 29. The different fauna that was present in the Eagle Ford suggests the waters were calm and within the photic zone. 30. Where phosphate is the limiting nutrient in the photic zone, addition of phosphate is expected to increase primary production.
