Environmental Science
Nitrogen gas returns to the atmosphere by the action of

Nitrifying bacteria
Nitrogen fixing bacteria
Nitrate fertilizers
Denitrifying bacteria

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Environmental Science
Which among the following is related to the word Mesoderm ?

Binomial system of classification
Forms blood and bone (leads to complex internal organs)
No membrane-bound organelles, no peptidoglycan in cell walls, introns
Anatomically advanced animals having all three germ layers

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