According to periodic trends, bismuth has the greatest atomic radius.
 
        
             
        
        
        
Answer:
Glucose and oxygen are required for cellular respiration. As the law of conversation states, in a biochemical reaction, mass is conserved. The mass of hydrogen in the glucose is therefore conserved in the water molecules products.
 
        
             
        
        
        
Answer:
The fourth one.
Explanation:
The fourth graph shows an object speeding up ( accelerating ) coz the velocity (tangent at the curve ) at every point is different, hence denoting an acceleration. 
 
        
             
        
        
        
2 calcium molecules are needed