Please explain how cells obtain energy. Show how energy flow differs from chemical cycling. In your discussion please show what

Please explain how cells obtain energy. Show how energy flow differs from chemical cycling. In your discussion, please show what is the main source of this energy, how energy that is not converted to useful energy is usually given off as heat and the products of cellular respiration are used as reactants in photosynthesis.
Photosynthesis and respiration:
https://www.youtube.com/watch?v=0IJMRsTcwcg

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