Imagine you are listening to a lecture on biology. The professor says, 'The process of photosynthesis, by which green plants use sunlight to synthesize foods from carbon dioxide and water, is fundamental to life on Earth. It's a complex chain of chemical reactions.' What is the primary function of this statement in the lecture?
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A
To provide a detailed, step-by-step guide to the chemical reactions.
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B
To define a key term and state its overall importance.
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C
To argue that photosynthesis is more important than other biological processes.
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D
To introduce a brief history of the discovery of photosynthesis.