Answer:
A: Myelin sheath
Explanation:
Myelin sheath swiftly transmits electrical impulses along nerve cells. 
 
        
             
        
        
        
Answer:
Photosynthesis and cellular respiration are connected through an important relationship. ... Notice that the equation for cellular respiration is the direct opposite of photosynthesis: Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O. Photosynthesis: 6CO2 + 6H2O → C6H12O6+ 6O
Explanation:
 
        
             
        
        
        
It is B and I know it because I am in college and I already know about this question so your welcome for helping put
        
             
        
        
        
Evolution would be the answer you may be looking for.