The whale's flipper and tail flukes and fish fins are analogous structure as they have different structural formation but they perform the same function. 
Flipper and tails are locomotory organs in the whale  and helps the whale in propelling similarly fins in the fish assist the fish in swimming. Both the strcutures have evolved differently and are made of different materials. 
 
 
        
             
        
        
        
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A living organism's position in the flow of energy through an ecosystem.
 
        
             
        
        
        
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anopheles mosquitoes is very painles when it is bite in our skin
 
        
             
        
        
        
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.