Answer: option A - bottleneck effect
Explanation:
Whenever sudden change caused by human or natural disasters occurs in the environment leading to the reduction of organisms or biodiversity present to a lower size, such condition is referred to as BOTTLENECK EFFECT.
 
        
             
        
        
        
your answer would be c) iron deficiency
 
        
             
        
        
        
Answer:
water is constantly moving across the earth. The water is strong enough to break down soil in tiny pieces. What’s happening is a process called erosion. Erosion is: the process of eroding or being eroded by wind, water, or other natural agents.
"the problem of soil erosion".
Water also carries sand and moves it around, this obviously changes the shape of the earths surface!
Explanation:
 
        
             
        
        
        
Answer:
B
Explanation:
It would be a mutation in a native bacteria. 
 
        
             
        
        
        
  an abnormal growth of scar tissue that is thick and out of proportion is called a keloid