The difference between the two students that we know of is that they used a different meter stick. So the difference would be best attributed to  the different tools they used. 
Note, this is quite a huge difference. It's likely that one of the sticks, or both, are quite defect.
        
             
        
        
        
Answer:
D. A brown gas produced
Explanation:
When a chemical reaction occur, there are several changes that takes place such as change in color, odor change, formation of a gas, and formation of a precipitate etcetera.
In the given chemical reaction, two colorless gas (NO and O2) react together and form brown gas (NO2). So, the change of gas from colorless to brown gas is the evidence that shows chemical reaction occurred.
Hence, the correct option is "D. A brown gas produced".
 
        
             
        
        
        
Answer:
IV: Student grade level (6th, 7th, 8th)
DV: "Loudness" (Operationalizing this variable would be beneficial, or in other words, define a way to measure it)
Explanation:
 
        
             
        
        
        
I think the priority action is to monitor Bowel movements. 
Kayexalate causes potassium to be exchanged for sodium in the intestines and excreted through bowel movements. If the client does not have stools, the drug cannot work properly. Blood pressure and the urine output are not of primary importance. The nurse would already expect changes in T waves with hyperkalemia. Normal serum potassium is 3.5 to 5.5 mEq/L. 
        
             
        
        
        
They would have had to have received the gene from both their mother and father. This gene is carried on the X chromosome and is only shown in females when it is present on both.