Why can most mammals not survive in the ocean?
Most mammals are not adapted to survival in the ocean, as the environment is very different from their terrestrial habitats. Marine environments pose a number of challenges for mammals, including:

    Density: The ocean is much denser than air, which can make it difficult for mammals to swim and float.

    Temperature: The ocean can be much colder than land, and many mammals do not have adaptations that allow them to regulate their body temperature in these environments.

    Salinity: The high salt concentration in seawater can have a harmful effect on the internal organs of mammals.

    Lack of food: Most mammals are used to finding food on land, and the ocean presents a different set of challenges in terms of food sources.

    Pressure: The deep ocean has high pressure levels that can be dangerous for mammals that are not adapted to it.

    Lack of oxygen: Some areas of the ocean have low levels of oxygen, which can be dangerous for mammals that require oxygen to survive.

In conclusion, these challenges make it difficult for most mammals to survive in the ocean, and those that do are often specialized species that have developed adaptations to overcome these difficulties.
Which adaptations have been found to be particularly successful and are most widespread among most mammals?