Approximately  10% of the stored energy of  an organism at  one level of a food web is transferred to the tissue of the organism that consumes it at the next level of the food web.
<h3>What is food web and its importance ?</h3>
A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is a part multiple food chains. The importance of food webs is to describe feeding relationship among species in a community. 
On an average only about 10 percent of energy stored as biomass in a trophic level is passed from one level to the next. 
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1 grass -2 beetle -3 bluebird-4 fox
        
                    
             
        
        
        
Answer:
Unequal heating of the earth
Explanation:
Warm air rises at the equator and moves towards the poles. At the poles,  the cooler air sinks and moves back to toward the equator