How can the energy stored in the photosynthetic organism be used? : "(

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Photosynthesis is the physico-chemical process by which plants, algae and photosynthetic bacteria use light energy to drive the synthesis of organic compounds. ... In addition, the fossil fuels currently being burned to provide energy for human activity were produced by ancient photosynthetic organisms.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.