If carbon dioxide is completely removed from a plant’s environment, what would you expect to happen to the plant’s production of high-energy sugars?

Let me help you... Okay, so, since the plant breathes only Carbon Dioxide, we can infer that that is a vital element in photosynthesis, which allows the plant to create sugars, or food, for itself. Without any air to breathe, the plant would first, sufficate, and second, no sugars will be created.