Answer:
Adaptations develop from variations within a population and help organisms to survive in their given environment. Changes in populations accumulate over time; this is called evolution. The fossil record shows us that present-day life forms evolved from earlier different life forms.
 
        
             
        
        
        
Answer:
Change in the species structure of an ecological community over time. (A)
Explanation: Google 
 
        
                    
             
        
        
        
Answer:
b
Explanation:
It is a fossil of sea shells
 
        
                    
             
        
        
        
Answer: it's because they need to provide a lot of energy.
Explanation: fat cells have many mitochondria because they store a lot of energy. Muscle cells have many mitochondria, which allows them to respond quickly to the need for doing work.
 
        
             
        
        
        
Answer:
the bottom left one is the one