| 31. | Isorenieratene and its derivatives are useful to marine chemists studying the carbon cycle as biomarkers that indicate photic zone anoxia.
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| 32. | The aphotic zone underlies the photic zone, which is that portion of a lake or ocean directly affected by sunlight.
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| 33. | The mixed layer can vary from being shallower than the photic zone, to being much deeper than the photic zone.
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| 34. | The mixed layer can vary from being shallower than the photic zone, to being much deeper than the photic zone.
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| 35. | Water levels at the reservoir fluctuate greatly throughout the year, which has led to decreased vegetation in the photic zone.
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| 36. | Since seagrasses photosynthesize and are submerged, they must grow submerged in the photic zone, where there is enough sunlight.
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| 37. | The transparency of the water, which determines the depth of the photic zone, is measured simply with a Secchi disk.
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| 38. | The upper photic zone is low in nutrient concentration, high in light intensity and penetration, and usually higher in temperature.
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| 39. | The middle photic zone is an area that contains the same values in between that of the lower and upper photic zones.
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| 40. | The middle photic zone is an area that contains the same values in between that of the lower and upper photic zones.
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