Which of the following is carried out by denitrifying bacteria? O A. break down large, nitrogen-rich molecules to simple molecules
O
B. build large, nitrogen-rich molecules from simple molecules
O C. convert biologically useful nitrogen to gaseous nitrogen
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O D. convert gaseous nitrogen to biologically useful nitrogen

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

Technology can bring both good and bad things. pesticides can make crops more resistant to insects (good) but can harm humans if they are used improperly (bad). give examples of both the good and bad