It is the third option
Carbon dioxide (CO2) + Water (H20) produces Glucose (C6H12O6) and Oxygen (O2)
The ones about enzymes are chemical digestion and the ones about chewing are mechanical digestion.
An irregularly occurring and complex series of climatic changes affecting the equatorial pacific region and beyond every few years, characterized by the appearance of unusually warm, nutrient-poor water off northern Peru and Ecuador, typically in late December