Question

Which is the basic requirement of living organisms for obtaining energy

Answer 1

In order to accomplish the task of photosynthesis, plants use Carbon Dioxide and water as raw materials. They combine it together to generate glucose from the inorganic substances in the presence of sunlight. 
The products of the whole process are carbohydrates and Oxygen which is important for all living organisms. 
Nutritional diet is also important for obtaining energy.
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Answer 2

food is the most essential and effective way to maintain energy for every organism