What type of organisms convert nitrates and nitrites into nitrogen gas?

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#Question id: 24194

#Aptitude

Today’s shopping mall has as its antecedents historical marketplaces, such as Greek agoras, European piazzas, and Asian bazaars. The purpose of these sites, as with the shopping mall, is both economic and social. People not only go to buy and sell wares, but also to be seen, catch up on news, and be part of the human drama.

The paragraph best supports the statement that 

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#Question id: 10990

#7. System Physiology – Animal

Sympathetic stimulation of the heart normally causes which of the following conditions?

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#Question id: 18896

#13. Methods in Biology

Negative Staining is used for examining.

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#Question id: 11120

#7. System Physiology – Animal

The release of neurotransmitter at a chemical synapse in the central nervous system is dependent upon which of the following?

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#Question id: 12579

#10. Ecological Principles

Which of the following probably contains the highest concentration of toxic pollutants (biological magnification)?