D. Friends of the scientists who wrote the articles 
Because the word “peer” is also another word for friends
        
             
        
        
        
Answer:
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Explanation:
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The answer is letter C. The distribution of oak trees in an
area.
Population Ecologist would often measure the number
distribution and density of the area. Trees are often measured by plots or by
hectares. This is to know how many trees are situated in that
area.