Which trophic level (producer/1st/2nd/3rd order heterotroph) has the most energy? explain where their energy comes from and how they utilize this energy source.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

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