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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.
Question
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
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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
Question
Updated 7/21/2018 3:36:57 PM
1 Answer/Comment
Primary succession takes place when there is no existing biotic community or soil to begin with.
Added 7/21/2018 3:36:57 PM
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Confirmed by 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
Question
Updated 5/20/2016 2:43:54 PM
1 Answer/Comment
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
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Confirmed by jeifunk [5/21/2016 1:34:31 AM]
An organism that makes its own food, usually through photosynthesis, is known as a(n) _______. A. producer. B. consumer. C. predator. D. nitrogen-fixer.
Question
Not Answered
Updated 12/5/2015 6:05:33 PM
1 Answer/Comment
An organism that makes its own food, usually through photosynthesis, is known as a producer.
Added 12/5/2015 6:05:33 PM
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Confirmed by yumdrea [12/6/2015 10:47:27 PM]
The water cycle is driven by _______. A. heat from the sun. B. precipitation in the form of rain or snow. C. condensation of water droplets in clouds. D. clouds meeting cool air.
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Updated 1/29/2016 2:36:06 PM
1 Answer/Comment
The water cycle is driven by heat from the sun.
Added 1/29/2016 12:55:35 PM
This answer has been confirmed as correct and helpful.
Confirmed by Andrew. [1/29/2016 2:36:07 PM]
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