Homozygous dominant allele is RR
        
                    
             
        
        
        
Answer: atomic mass is the amount of protons and neutrons
Explanation:
 
        
             
        
        
        
Light that passes through a polarizing filter is called a vacuum.
        
                    
             
        
        
        
Answer:
Passive Transport
Explanation:
The movement of molecules from an area of High concentration to an area of lower concentration in a living cell is called Passive Transport.
Passive Transport does not require energy input.
An example is Diffusion.