Carbon dating is a process that estimates the age of anything. However, there are flaws that exist. It may not be a precise number, but it does gives a good estimation.
        
             
        
        
        
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c I think because I remember this from a while ago
 
        
                    
             
        
        
        
Living things in the environment such as plants, animals, and bacteria are biotic factors. Biotic factors also include once-living parts such as dead leaves on the forest floor. Abiotic factors are nonliving aspects of the environment such as sunlight, temperature and water. One important abiotic factor is soil.
        
             
        
        
        
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They may change due to environmental changes. for example, if a cactus suddenly experiences a drought, it may change to become better at holding water than before. if it suddenly experiences large amounts of rainfall, it may change to release more water, etc.