A. the population of higher trophic levels is greater than lower trophic levels
        
             
        
        
        
The Earth System includes the core, mantle, and crust
This can also be labeled as the earth's Interiors
        
                    
             
        
        
        
Answer:
C. Snowshoe hares change their fur from white to brown to match their summer habitats.
Explanation:
The gene to change the fur color is passed on generation to generation, so the hares can survive in both winter and summer time.
 
        
                    
             
        
        
        
1. Testosterone 
2. Penis
3. Testes
4. Semen
5. Scrotum
6. Vas Defrens
7. Seminal Vesicle
        
                    
             
        
        
        
Answer:
they need a high ‘surface to volume’ ratio, which is good for exchanging materials between the inside and outside of cells. But this is probably not really the size-limiting reason, since cells vary enormously in size and surface area to volume ratios.
Explanation: