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Since the beginning of time all oxygen on the earth has been produced by a prossess called
photosynthesis. This process occurs in plants and is very nessesary in the lives of humans and all other organisms. Photosynthesis
is a form of energy transfer. As you go further in our website you will learn much more about photosynthesis and other
forms of energy transfer such as cellular respiration. You will learn where each process takes place, how each process
works, and why energy transfers play a key role in the earth and in our lives as humans. The image below shows where
the process of photosynthesis takes place in plants.
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