Photosynthesis is
1 An exothermic process
2 An endothermic process
3 A neutral process
4 A thermostatic process
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Answer / pierre verville
To be stable a molecule must be exothermic at its formation.
A new endothermic molecule will necessitate energy to
maintain its structure. So endothermic oxygen of the
photosynthesis will freeze the atmosphere.
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Biological Sciences 
