There are around 350,000-600,000
        
             
        
        
        
The correct answer is A.primary, because a primary landform is a natural feature on earth's surface.
        
                    
             
        
        
        
Answer:2. Flooding and 4 run off 
Explanation:Watershed areas are prone to flooding. They also cause a lot of runoff 
 
        
             
        
        
        
I believe that hair and limbs are homology because all mammals have hair and similar limb structure. Hair loss and social behavior on the other hand are homolasy because not all mammals have them. Homology is the similar traits due to common ancestry while homoplasy is similar traits for other reasons other than common ancestry. 
        
             
        
        
        
I is answer. Don't open link. It is most likeky unsafe.