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| zone in aquatic system that light reaches... uppermost zone |
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| this nutrient is the most important contributor to the fertility of most lakes |
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| overproduction of OM within a lake or river |
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| symbiotic associations of certain types of fungi with the roots of plants |
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| spacially removed, can be anoxic |
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| how do sediments at lake bottoms behave differently than terrestrial soils? |
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| vertical mixing is inhibited by ____ ____. |
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| estuaries and salt marshes |
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| these two ecosystems are especially productive |
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