Global warming and the greenhouse effect are related because they are both caused by pollution and rising global temperatures by human activity.
        
                    
             
        
        
        
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Stalactites-a tapering structure hanging like an icicle from the roof of a cave, formed of calcium salts deposited by dripping water.
Stalagmites-a mound or tapering column rising from the floor of a cave, formed of calcium salts deposited by dripping water and often uniting with a stalactite.
 
        
             
        
        
        
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These rings can tell us how old the tree is, and what the weather was like during each year of the tree's life. Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area's local climate in the past.
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The primary roles done by these biological macromolecules in the biological processes in each organism is that contains substances that are considered as essential for these process and among which in macroscopic sizes are carbohydrates, lipids, proteins and many others.