Answer:
They repel one another. I think 
 
        
                    
             
        
        
        
That would be integumentary system 
        
             
        
        
        
Answer:
Yes
Explanation:
Amino acids create proteins
 
        
                    
             
        
        
        
In biology, a mutation is the permanent alteration of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements. Mutations result from errors during DNA replication or other types of damage to DNA, which then may undergo error-prone repair, or cause an error during other forms of repair, or else may cause an error during replication. Mutations may also result from insertion or deletion of segments of DNA due to mobile genetic elements. Mutations may or may not produce discernible changes in the observable characteristics of an organism.
        
             
        
        
        
The word- descriptions pair should be paired as follows; 
- blood viscosity: the friction red blood cells encounter when moving past each other
- blood pressure: the force of the blood against the vessel wall.
- cardiac output: the volume of blood pumped out by one ventricle each minute.