Comprehension — quick quiz

Read the passage carefully and answer the question that follows: "Photosynthesis is the process by which green plants manufacture their own food using sunlight, carbon dioxide, and water. Chlorophyll, the green pigment in leaves, captures light energy from the sun. This energy is used to convert carbon dioxide from the air and water from the soil into glucose, a type of sugar. Oxygen is released as a by-product of this process. Without photosynthesis, life on Earth would not be sustainable, as it is the primary source of oxygen in the atmosphere and the foundation of most food chains." Based on the passage, which of the following can be inferred about the relationship between photosynthesis and life on Earth?