Darwin called the ability of an organism to survive and reproduce in its environment fitness.
Some organisms were fit to do all of these things, whereas others were not. 
        
                    
             
        
        
        
Answer: I think its B
Explanation: I hope this helps :)
 
        
                    
             
        
        
        
Ans. 
Lac (lactose) operon in a type of bacterial operon, which shows a cluster of genes that are regulated by a single promoter. It is composed of an operator, promoter, a terminator, and three structural genes (lacA, lacY, and lacZ), which are responsible for the transport and breakdown of lactose. 
The lac operon is an inducible operon as it gets activated in the presence of lactose and expressed its functional genes in the form of proteins (or enzymes) for lactose metabolism.  
Thus, the correct answer to be fill in first blank is 'inducible' and in second blank is 'lactose.'
 
        
                    
             
        
        
        
Answer:
Many different genes control the height of the plants
hope this helps! <3