Which of the following nitrogen compounds is NOT created by
nitrifying bacteria?
A. nitrite (NO2)
B. free nitrogen (N2)
C. nitrate (NO3)

Are the earth's ocean floor and continents the same age geologically? why or why not?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Jane has a sprained ankle, and her doctor gave her a prescription that states: “ibuprofen caps 200 mg tid po.” what does this prescription say, in spelled-out form?