Answer:
population is number of inhabitants in area or place 
 
        
                    
             
        
        
        
Answer:
Nucleus 
Explanation:
It is the unit of heredity and it controls the activities of the cell
 
        
             
        
        
        
Answer: B. The color of a mineral's powder doesn't change.
C. The densities of many minerals are quite similar.
D. A mineral can break in only one way.
A mineral is a naturally occurring inorganic compound. It is a chemical compound that usually found in crystalline form. The color of the mineral's powder can change because of the oxidation or reduction of particles present in it. The density of many minerals cannot be same because all mineral particles exhibit different composition of atoms or molecules which are responsible for physical and chemical structure of minerals. Hence, minerals vary in density. A mineral can be broken down into many ways like fracture, cleavage and other methods.  
 
        
             
        
        
        
The  above is  not  an  example  of   sexual  selection  because  sexual  selection  is  about differential success  in  acquiring males.In  sexual  selection  one  biological  sex  chose mates  of  other   sex  to  mate with. and  compete  with  members  of  the  same  sex for  access of  members  of  opposite  sex