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Pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.
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C. The upper part of the water column represents areas of high sunlight penetration.
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I just took the test and checked my answers. 
 
        
             
        
        
        
An isolated colony on a selective medium is not considered a pure culture because inhibited organisms might be masked by the colonies. This statement is true.
On the basis of their constitution or usage, culture media can be classified into various groups; these include defined, complex, selective, as well as enrichment medium. 
A selective medium consists of dyes or noxious substances/chemicals which inhibit the growth of specific microorganisms but promote the growth of other microbes.
A pure culture is a laboratory culture which contains a single species of microorganism. It is free from other microorganisms.
Since selective media affects the growth of distinct organisms differently, therefore, an isolated colony formed in such type of medium is not considered a pure culture.
To learn more about pure culture here
brainly.com/question/21512552
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I think the amount of ATP produced is best distinguishes glycolysis and the Krebs cycle from the electron transport chain.
        
                    
             
        
        
        
One scientist who attempted to explain how rock layers form and change over time was... James Hutton. 
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