Answer:
Dissimilatory- oxygen absent
Assimilatory- high concentration of nitrite 
Explanation:
In assimilatory nitrate reduction, ammonium is produced and subsequently incorporated into biomass to build up e.g., proteins and nucleic acids. Dissimilatory nitrate reduction is a process for energy conservation, in which nitrate is used as an electron acceptor in the (near) absence of oxygen . Dissimilatory nitrate reduction and nitrate storage in particular are physiological life traits that provide microbes with environmental flexibility (i.e., metabolic activity under both oxic and anoxic conditions) and resource independence (i.e., anaerobic metabolism without immediate nitrate supply), respectively. Such life traits are especially important in environments that are temporarily anoxic and/or nitrate-free and they may have developed as a “life strategy” in both prokaryotes and eukaryotes 
 
        
             
        
        
        
B is the answer. my aunt has a malignant tumor and that means its active
        
             
        
        
        
The actual answer is, "A", an ocean trench.
You can find out more about them by researching them up on Google, it's only a few phrases and a hit on the enter key :P
        
             
        
        
        
The answer to the question is no, you can’t expect to find
black sand beaches on Kauai, it is because black sand beaches are only found on
islands that are recently have been formed from the black larva that has been
breakdown from the volcanoes that had been erupted and Kauai is not included.
You can only expect to find at this island is white and yellow sand beaches.