Answer:
D. reproduction
Explanation:
 If the species doesn't reproduce they die out or become extinct.
 
        
             
        
        
        
Number 3 is microorganisms.
        
             
        
        
        
<span>a)there would be a decrease in consumers 
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Answer:
Cells are sometimes referred to as "life's atoms" because there the basic units of life. All cells are surrounded by a structure called the cell membrane — which, serves as a clear boundary between the cell's internal and external environments.