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iTEP - International Test of English Proficiency Listening to Academic Lectures Questions and Answers

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?

Select your answer