Cottonwood trees are commonly found along river banks and irrigation ditches. They have broad flat leaves and can transpire 200 gallons of water per day. Many succulent plants live in hot, arid environments and have thick leaves with a wax-like substance covering their leaves. They generally open their stomata for gas exchange at night. Using your understanding of transpiration and the results of your lab, discuss the adaptations that allow these plants to survive in their respective environments.