When a brown bear eats a salmon, does the bear acquire all the energy contained in the body of the fish? Why or why not?
Question asked by: knowitall
No the brown bear does not acquire all the energy. That is why as you go up the food chain you need to eat more and more food to get the calories and energy you require.
Perhaps ten percent of the energy will be acquired.
This is because the body is not 100% efficient at taking energy from what we eat and transferring across from us. Energy in a lot of the salmon will not be used by the bear and will be passed out as faeces; also energy is used in digesting the food; and much is locked away in the food that cannot be accessed.
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