A fertilized egg splitting into two embryoa
        
                    
             
        
        
        
They are positively and negatively charged
        
             
        
        
        
Given that a blowfly starts its lifecycle only if there are appropriate conditions met, one of which is suitable temperature, the correct answers as to what can impact the timing of the blowfly lifecycle is the air temperature.
I don't see how humans will impact when this fly is going to be born, so A and C are incorrect. Leaves also doesn't really affect blowflies, which is why D is incorrect as well. 
        
                    
             
        
        
        
answer
Explanation:
It may exist quickly but it may benefit the anointing in our environment