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What percentage of fish species live in freshwater ecosystems?
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Asked 3/7/2011 9:22:36 PM
Updated 3/7/2011 11:39:10 PM
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about 33%
Added 3/7/2011 11:39:10 PM
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Updated 5/23/2011 2:19:48 PM
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What do the lichens and mosses produce to break down rocks to begin the formation of soil?
Acids
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Asked 3/7/2011 8:22:56 PM
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How long can primary succession take to be completed?
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Updated 7/14/2011 11:28:34 AM
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hundreds to ten thousands of years
Added 7/14/2011 11:28:34 AM
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Updated 3/7/2011 11:37:05 PM
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The largest ecosystem on the earth is the oceans

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Added 3/7/2011 11:37:06 PM
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