Answer: Polygenic inheritance 
Explanation:
Polygenic inheritance is a phenomenon shown by a trait that is controlled by many genes residing at different loci. 
Thus, the expression of the trait is the total effect of all the genes controlling it. Skin colour and height in humans are examples of such traits. 
 
        
                    
             
        
        
        
B.) Sodium is in the left than any other...so it's the most  metallic
        
                    
             
        
        
        
Answer:
Beavers and their dams play an important role in nature. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species. By constructing dams they create wetlands -- lush environments which attract fish, ducks, frogs and other creatures.
Explanation:
 
        
             
        
        
        
Undersea volcano erupts,then seeds are carried,then grass seeds poke out and later on grow, then shrubs and bushes are formed, then later grow on to be trees, then the island becomes a thick forest, then a volcano eventually erupts, causing the forest to be covered in hot, fresh lava, then the cycle continues! Have a wonderful day!
 
        
             
        
        
        
Microbial life is important because this is bacteria. these bacteria's supply health to humans and animals. even though they also supply sickness. also these microbial life forms are the cells in us. its the oxygen in the air, its the gravity. it is everything that defines science except we cant see it. hope it helps, tag me if you need help, and plz choose brainliest