<span>During nitrification, ammonia is changed back into nitrate.</span> 
Nitrification is a three-step process of oxidation of ammonia. It is an aerobic process performed by small groups of autotrophic bacteria (<span>Nitrosomonas,
Nitrobacter</span>). 
First step- ammonia to hydroxylamine, 
Second step-hydroxylamine to nitrite, 
Third step-nitrite to nitrate. 
Nitrification together with ammonification is part of a nitrogen cycle.
        
             
        
        
        
Answer:
C- DNA
Explanation:
DNA is responsible for protein synthesis.
 
        
                    
             
        
        
        
Answer:
thigmotropism
Explanation:
plant growth in response to touch. Plant tendrils are wrapping around the stick.
 
        
                    
             
        
        
        
Answer:
Interrupt the long winter nights with a brief period of light.
Explanation:
Long day plants, also called short night plants, flower when the dark period is equal or less than the critical period specific for the species. These plants normally flower in summers when nights are short and days are longer. Winters have a long dark period and do not support flowering in shirt night plants. 
A continuous dark period is critical for flowering. A short night plant can flower in winters (having longer dark periods) if the dark period is interrupted by exposing the plant with a flash of light. To make short night plants, such as iris to flower in winters, the plant should be given short period of light after completion of critical dark period. 
 
        
             
        
        
        
That means this gene is responsible for developing two independent features (in this case blue eyes feature and deafness)