<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:
dear user nitrogen fixation is so important bcoz of the reasons given above 
 
        
             
        
        
        
The statement which describes a modified endowment contract is this: 'Exceed the maximum amount of premium that can be paid into a policy and still have it recognized as a life insurance contract.
A modified endowment contract is a type of life insurance contract which has been funded with more money than allowed. Such a life insurance will no longer be regarded as life insurance by IRS, it will be considered as a modified endowment contract.