Genetic variation is important because a population has a better chance of surviving and flourishing than a population with limited genetic variation. Genetic diversity also decreases the occurrence of unfavorable inherited traits. 
 
        
                    
             
        
        
        
Answer:
The population of the white mice would significantly decrease, and most of the mouse population would be with brown fur.
Explanation:
As stated in the question, the brown mice survive better in warmer times. This is due to the fact that with winter and snowy times it makes it harder for prey to spot the WHITE mice v.s. the BROWN mice who would very easily be spotted by the prey in snowy regions. 
 
        
             
        
        
        
A primary oocyte residing in a primordial follicle becomes a secondary oocyte "in the vesicular follicle".
        
                    
             
        
        
        
Answer:
electron, carbon, protein, mitochondria, neurons, mass of neuron, nervous system, brain, man