Answer:
A
Step-by-step explanation:
Water acts a temperature buffer and regulates the fluctuations of temperatures in a cell of an organism and even outside within the habitat of organisms such as fishes. The property that allows water to have this benefit is its high heat capacity. This means it required a lot of energy to have its temperatures raised by a degree (compared to most other substances) while also requiring to lose the same amount of energy to lower its temperature by a degree.
Therefore, even in very hot days water can ensure that an organism stays cool and that its protein structures do not easily denature from a high environmental temperature rise, or freeze from low environmental temperatures. If water did not have this property, it would not be able to protect cells and organisms from high-temperature fluctuations.