| 1. | The profundal zone is often part of the aphotic zone.
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| 2. | Zones which vary by the amount of light they receive include the photic and aphotic zones.
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| 3. | For information on animals that live in the deeper areas of the oceans see aphotic zone.
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| 4. | Much of the aphotic zone's energy is supplied by the open ocean in the form of detritus.
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| 5. | The depth of the aphotic zone can be greatly affected by such things as turbidity and the season of the year.
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| 6. | The aphotic zone underlies the photic zone, which is that portion of a lake or ocean directly affected by sunlight.
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| 7. | The deep sea starts at the aphotic zone, the point where sunlight loses most of its energy in the water.
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| 8. | The aphotic zone is further divided into additional zones : the bathyal zone, the abyssal zone, and the hadal zone.
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| 9. | Extending from the bottom of the photic zone down to the seabed is the aphotic zone, a region of perpetual darkness.
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| 10. | Changes in primary production in the photic zone are expected to alter the standing stocks in the food-limited aphotic zone.
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