Nitrification. The conversion of ammonium to nitrate is performed primarily by soil-living bacteria and other nitrifying bacteria. In the primary stage of nitrification, the oxidation of ammonium ( NH+4) is performed by bacteria such as the Nitrosomonas species, which converts ammonia to nitrites ( NO−2).
        
                    
             
        
        
        
The process in which the receptors in the skin turn the stimulation into a neural impulse is called transduction. In addition, transduction is the process by which sensory input is converted to a neural code and sent to the brain. A signal in which a hormone or neurotransmitter interrelates with a receptor on the cell surface in which this contact causes a alteration in a second messenger such calcium and will eventually a alteration is activated in the function of cell. 
        
             
        
        
        
<span>Genetic variation in bacterial made it possible for some individuals to have resistance to the antibiotic, survive, and reproduce is a statement that explains the theory of evolution very well. Some of the bacteria that became resistant to the antibiotics, passes this down the genes for drug resistance. I hope the answer helps you.</span>
        
                    
             
        
        
        
Definitely decompose dead organisms, otherwise there would be no oil for us.
        
             
        
        
        
Answer: The hepatic portal vein is one of the most important vein that receives blood from the body and transports it into the liver for filtration and processing. This vein is part of the hepatic portal system that receives all of the blood draining from the abdominal digestive tract, as well as from the pancreas, gallbladder, and spleen.
‘Hepatic’ means of or relating to the liver, therefore the hepatic portal vein is a blood vessel that sends nutrient-rich blood from the gastrointestinal tract and spleen to the liver, but also delivers toxins to the liver that will be chemically modified in the proces of detoxication