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Nitrogen gas makes up _____ of the air in the atmosphere. A. 11% B. 24% C. 46% D. 78%
Nitrogen gas makes up 78% of the air in the atmosphere.
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Asked 1/23/2013 4:59:46 PM
Updated 5/22/2014 9:30:55 AM
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Nitrogen gas makes up 78% of the air in the atmosphere.
Added 5/22/2014 9:30:55 AM
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A few specialized forms of bacteria that are able to obtain nitrogen directly from the atmosphere are known as _______. A. intestinal bacteria. B. oxygen-fixing bacteria. C. nitrogen-fixing bacteria. D. carbon-fixing bacteria.
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Updated 7/1/2015 11:49:04 AM
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A few specialized forms of bacteria that are able to obtain nitrogen directly from the atmosphere are known as nitrogen-fixing bacteria.
Added 7/1/2015 11:49:04 AM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [7/1/2015 11:53:02 AM]
What type of succession takes place when there is no existing biotic community or soil to begin with? A. Primary succession B. Secondary succession C. Tertiary succession D. None of these answers are correct
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Updated 117 days ago|7/21/2018 3:36:57 PM
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Primary succession takes place when there is no existing biotic community or soil to begin with.
Added 117 days ago|7/21/2018 3:36:57 PM
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Confirmed by Janet17 [7/21/2018 3:39:43 PM], Janet17 [7/21/2018 3:39:43 PM]
What type of succession takes place when there is an existing biotic community in the soil to begin with? A. Environmental succession B. Primary succession C. Secondary Succession D. Tertiary succession
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Updated 5/20/2016 2:43:54 PM
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SECONDARY succession takes place when there is an existing biotic community in the soil to begin with.
Added 5/20/2016 2:43:54 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [5/21/2016 1:34:31 AM]
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