Melting glaciers alters the ocean
        
             
        
        
        
A circle graph, or a pie chart or graph, would be the type of graph that is best used when showing the <span>percentage of reactant molecules that collide during a reaction in a graphical representation. In addition, the circle graph mainly consists of a circle being divided into parts proportional to the whole.</span>
        
                    
             
        
        
        
Answer:
Friction
Explanation:
Friction is the name of the force that opposes motion. 
 
        
             
        
        
        
Answer:
3 half-lives
Explanation:
The half-life is the time that it takes to a radioactive element to decay to half of its initial amount.
Let's suppose we start with 64 g of the radioactive element.
- After 1 half-life, the mass of the element will be 32 g.
 
- After 2 half-lives, the mass of the element will be 16 g.
 
- After 3 half-lives, the mass of the element will be 8 g.