Answer:
Cobalt  Co
Explanation:
Co and Zn can fully replace each other, except perhaps for  small individual requirements that are met by minute metal concentrations supplied as contaminants.
 
        
             
        
        
        
Choice C. Educated guess or a prediction that can be tested, based on limited evidence. 
 
        
             
        
        
        
Pls i need to pass this class
        
             
        
        
        
<h3><u>
Answer;</u></h3>
-The name of the general was Leslie Richard Groves Jr. He Graduated fourth in his class<u><em> in the U.S. Military Academy at West point.</em></u>
<h3><u>
Explanation;</u></h3>
- <u>The name of the general was Leslie Richard Groves Jr. He graduated from the United States Military Academy of West point in the year 1918.</u>
- As an engineering aide, He led a small team of workers who helped produce the exterior casing of "Fat Man," a nuclear bomb dropped on Nagasaki, Japan, that hastened the Japanese unconditional surrender three weeks later.