"The photosynthesizers or producers provide the foundation for the entire food web. Without them, no living things could survive. This seems like a simple idea, but it is one whose significance is often lost. Can you think of an analogy that would help clarify the importance and uniqueness of the conversion of inorganic CO2 to organic sugars by green plants during photosynthesis? For example, one analogy might be: "A green plant is like a magician - it creates itself out of thin air." Can you think of others? "