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A long-term relationship between two species that usually involves an exchange of food or energy is A. predation. B. symbiosis. C. niche. D. competition.
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User: A long-term relationship between two species that usually involves an exchange of food or energy is A. predation. B. symbiosis. C. niche. D. competition.

Weegy: b. mutualism, commensalism, and parasitism- are the three types of symbiosis.
yumdrea|Points 4850|

User: Which of the following does not contribute to eutrophication? A. Decaying organisms B. Fertilizer C. Pollution D. Sediment

Weegy: A. Pollution does not contribute to eutrophication.
jeifunk|Points 15414|

User: Which biome contains permafrost? A. Temperate deciduous forest B. Tundra C. Taiga D. Temperate rain forest

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Asked 2/15/2014 5:00:41 AM
Updated 2/15/2014 5:31:45 AM
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Flagged by jeifunk [2/15/2014 5:31:45 AM]
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B. TUNDRA forest contains permafrost.
Added 2/15/2014 5:31:09 AM
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A long-term relationship between two species that usually involves an exchange of food or energy is MUTUALISM.
Added 2/15/2014 5:31:44 AM
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Added 180 days ago|11/30/2015 9:32:13 AM
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Confirmed by Andrew. [11/30/2015 9:35:26 AM]
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Added 2/14/2014 2:02:00 AM
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