Active transport is a cellular transport mechanism. It’s the movement of molecules that are assisted by enzymes along the way to a higher concentration. 
        
             
        
        
        
Under the leadership of Mikhail Gorbachev, the doctrine of perestroika called for "<span>A. Openness in communication", since the "closed off" Soviet Tactics of the past were clearly not working by the 1980s.</span>
        
             
        
        
        
Be there for them and let them know they're not alone.
        
             
        
        
        
Answer: 
Nervous: carries messages
muscular: moves the body
epithelium: found in cartilage
connective: found in cartilage 
Explanation: