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Environmental Systems Question

I might need some help with the following question: 


1)a) 300 000 Joules of energy are stored in a patch of grass on a meadow. How many of those joules would be available to a tertiary consumer? 


b) According to the 2nd law of thermodynamics, the biomass stored in plants cannot all be used to feed other organisms. What percentage of the energy stored as biomass in plants is transferred, on average to the next trophic level of the food chain? Apply the 2nd law of thermodynamics to explain this. 

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