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"Comparative Physiology"
Pure water has both a freezing point and melting point of 0˚C; however water also has colligative properties meaning that the freezing point can vary depending on the number of molecules dissolved in it.
Diving to depth is a typical behaviour observed in many aquatic mammals such as; whales, otters, seals, walrus and many others. Such mammals are well adapted at diving. The Weddell seal for example, is able to dive for periods of 80 minutes and more.
Oxygen comprises a large proportion of our atmosphere (21%) and has become a vital gas for many organisms on Earth. Without it our ability to produce energy (as ATP) via aerobic respiration fails.
