As you increase exercise and muscle activity, your heart rates increases. That is one feedback mechanism. Your heart delivers oxygen and nutrients to your muscle and other parts of the body quicker. 
        
             
        
        
        
Answer:
Lack of gravity causes you to use less work to move your muscles.
Explanation:
If on Earth your arm weighs 3 pounds, the muscle will only have to move 3 pounds of force. For example, if you were to go on the moon, your arm would have the same mass but there would be less gravity pulling it dow. So now your muscles only need to pull 1 pound. Over extended periods, you would be working less, thus not using your muscles to fullest potential and in result you would get weaker.
 
        
                    
             
        
        
        
Okazaki fragments are the discontinuous segments of the lagging strand.
Okazaki fragments are located on the template strand which dictates the newly synthesized DNA away from the direction of the movement of replication fork. It is the building block for DNA synthesis of the lagging strand and on one template strand, the DNA polymerase synthesizes the new DNA in the opposite direction that is away from the replication fork movement.
 
        
             
        
        
        
Carbon dioxide (CO²) is taken in to start the Calvin Cycle.
 
        
             
        
        
        
False, that's actually backwards I believe.
~Wolfe<3