Answer:
the 1rst and 2nd 
Explanation:
 all fertile individuals can breed with one another and individuals vary genetically
 
        
             
        
        
        
In the vacuum of space there is no molecules. Sound waves get to your ears by bouncing off of molecules in the air. No molecules in space's vacuum means sound waves have nothing to bounce of off so they can not reach our ears meaning we hear no sound.
        
             
        
        
        
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Answer:
d the squirrel population
Explanation: