Final answer:
Water stays cool in hot temperatures due to its high specific heat capacity, which allows it to absorb and store heat without a significant rise in temperature. This helps regulate temperature in the body and environment. Water's evaporation through sweat also helps cool organisms.
Step-by-step explanation:
Water has the ability to stay cool even in hot temperatures because it has a high specific heat capacity. This means that water can absorb and store a large amount of heat energy without a significant rise in temperature. As a result, it helps to regulate temperature in the body and in the environment. Additionally, water's ability to evaporate and carry away heat through sweat helps to cool organisms.