Over long periods of time, living things have gradually altered as the conditions around them change. A species' strongest traits are passed from one generation to the next. This is what evolution is, the process of gradual change.
 
        
                    
             
        
        
        
Answer:
beaver dams smooth out water flow by increasing the area wetted by the stream. This allows more water to seep into the ground where its flow is slowed. This water eventually finds its way back to the stream. Rivers with beaver dams in their head waters have lower high water and higher low water levels.
Explanation: Brainlest plz?
 
        
                    
             
        
        
        
Answer:
The moon, sun, river, clouds, mountain, rain, water and so on.
 
        
             
        
        
        
You may be referring to the nucleus. The nucleus controls the cell, and it contains chromosomes (DNA) genetic makeup. Hope I could help|!