The circulatory system and respiratory system are protected by your skin, muscles, and ribs.
        
                    
             
        
        
        
Answer:
B. very high genetic variation
Explanation:
Selective breeding is the process by which crops or animals with desired phenotypic traits are chosen to produce offspring, which will contain the desired qualities. In this case, a group of scientists is trying to apply the principles of selective breeding to develop a particular crop plant. 
This goal of producing a useful crop plant by the scientists can only be achieved when the plant species in question possess a HIGH GENETIC VARIATION i.e. difference in genetic constitution of individuals of the same species. This allows the individuals in the population to survive better. 
 
        
                    
             
        
        
        
Answer:
1. Evaporation
2. Lengthening of a river upslope.
3. Sand and gravel
4.  Storm surge
5. Adds clean water to the drinking water supply
6.  cuts down on the number of open pores 
7.  A confined aquifer is pumped for drinking water
 
        
             
        
        
        
An ecological niche is an organism's specific habitat in an ecosystem.
It is where it lives and feeds, etc.
        
                    
             
        
        
        
Answer:
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