no
They are interconnected
All of the oceans and seas
No, there are 7 oceans and seas.
All of the oceans and seas
No, seas are bodies of saltwater that are connected to oceans and are typically surrounded by land on all sides. Continents are large landmasses that are also surrounded by water such as oceans and seas.
The humpback whale habitat is in all the oceans in the world.
Oceans and seas are not perfectly homogeneous.
In all of the oceans and all but the polar seas.
The world's oceans have a salinity of about 3.5%
Australia is an island continent, meaning that it is surrounded on all sides by oceans and seas. For a list of the seas and oceans surrounding Australia, see the related question.
They are found in all the warm oceans and seas. (first I wanted to say under the sea bed.) But they really do exist and live in all the warm oceans and seas.
Yes, the hydrosphere is all the oceans, seas and rivers of a planet.