Answer:
<h2>Apoenzyme
</h2><h2>Cofactors</h2>
Explanation:
Conjugated enzymes also known as holoenzyme. Simple enzymes consist of only protein alone  but  the Conjugated enzymes contain protein ( this portion is called Apoenzyme) and nonprotein molecules (this portion is called cofactor). Cofactor help enzymes in their action.
Enzymes are catalyst which increase the rate of a reaction by decreasing the activation energy.
 
        
                    
             
        
        
        
B - When many individuals of the same species are available for mating. 
And 
C - When the individuals live in a stable environment in which they thrive.
        
                    
             
        
        
        
It is the Mid-Atlantic Ridge.