C. The water cycle spreads water out evenly around the whole Earth
        
                    
             
        
        
        
Answer:
valves
The heart has four valves - one for each chamber of the heart. The valves keep blood moving through the heart in the right direction. 
 
        
                    
             
        
        
        
Hi!Schrodinger equation is written as HΨ = EΨ, where h is said to be a Hamiltonian operator.
 
        
             
        
        
        
The tectonic plates are made up of Earth's crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere. hope this helps :)
 
        
             
        
        
        
Prior to determining the
experimental design, a scientist typically forms a hypothesis. The answer is
letter B. this is to prepare the scientist, the possible outcome of their
research before the experimental design whether they are wrong or not.