D through a microscope!
hope this helps!
        
                    
             
        
        
        
Answer:
Newton's third law of motion is For every action, there is an equal and opposite reaction.
Explanation:
 So if you throw a tennis ball and then hit it with a tennis racquet then the action would be the tennis ball and the equal and opposite reaction woul be the tennis ball bouncing off of the tennis racquet.
 
        
             
        
        
        
Answer:
Contagious is a method in which a bloodborne pathogen may be transmitted
Explanation:
Contagious are contacted as a result of transmission through blood contact, serum, sweat among others where diseases are said to be infectious