By osmoregulation. Differs by species or type of organism, but they are either osmoconformers or osmoregulators.
The saltwater crocodile has gills.
Factors that determine the organisms in a saltwater ecosystem include salinity levels, temperature, oxygen availability, and nutrient levels. Organisms must be adapted to handle high salt concentrations and fluctuations in conditions like tides and currents.
Adaptation
In a typical saltwater swimming pool nothing living other then micro organisms should be able to survive. In a saltwater pool with water, filtration and components designed for marine life, they could.
no organisms adapt to the environment to help them survive
No, all organisms react to their environment to survive.
Adaptaion
by adopting to the environment that he lives or to the habitat.
Adaptation is important for organisms to survive in an environment for various reasons. The environment posses different threats to different organisms and having these special features is what makes it possible to survive.
Because they adapt
depending on the environment organisms must adapt in certain ways so they can survive
A pollution free underwater environment would help any number of animals that live in the sea, to survive and prosper.