(I) A large body of water can store a huge amount of heat from the sun during warm periods. (II) Evaporation from a plant's leaves keeps them from becoming too warm in the sun. (III) At cooler times, heat given off from the gradually cooling water can warm the air. (IV) That is why coastal areas generally have milder climates than inland regions. (V) Moreover, water's resistance to temperature change also stabilizes ocean temperatures, creating a favourable environment for marine life.