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Electrons are subatomic particles, whose electric charge is negative one elementary charge. They belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. 
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Answer:
density and color, do not depend on the amount of matter. your welcome
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A. the amount of lean muscle in a body 
        
                    
             
        
        
        
During a controlled experiment, a scientist will isolate and test (D) a single variable. A conclusion, nor a mass of information can be isolated or tested. A control group is the group that would receive a placebo, so testing that would be futile.
        
             
        
        
        
No becuase it is made of hydrogen so it dosen't freeze