"the process of hypothesis and testing through which scientific inquiry occurs"
 
        
             
        
        
        
In a discrete water molecule, there are two hydrogen atoms and one oxygen atom<span>. Two </span>molecules<span> of water can form a hydrogen bond between them; the simplest case, when only two </span>molecules<span> are present, is called the water dimer and is often used as a model system</span>
        
             
        
        
        
Increased levels of cortisol are associated with an infant's sadness. 
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Answer:
Nitrogen is converted from atmospheric nitrogen into forms, such as NO2-, in a process called fixation. The majority of nitrogen is fixed by bacteria, a lot of which are symbiotic with plants.
Answer: Fixation