Answer:
An amoeba's economic value can be found in medicine and nutrient recycling. According to Biology Reference, certain amoeba species can cause sickness and death, while others are important in maintaining healthy ecosystems because they recycle the nutrients needed by bacteria and keep the bacterium population under control.
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Answer:
To study objects that are way too small 
 
        
             
        
        
        
The answer is C. Either B or b
        
             
        
        
        
Answer:
D
Explanation:
An infection is when something invades your body, therefore, you are infected with micro-organisms making it D.