These are called resistors. 
        
                    
             
        
        
        
I think its C: due to mixing and oceanic.....
        
             
        
        
        
Answer:
Mark me brainliest
Explanation:
Standards help avoid confusion and ambiguity when taking measurements. For example, a meter will always be the same length, no matter who is taking the measurement or where it is being taken.
 
        
             
        
        
        
Answer:
An element that is oxidized is a reducing agent, because the element loses electrons, and an element that is reduced is an oxidizing agent, because the element gains electrons.