Question

define Marine ecosystem

Answer 1

hola...

here is ur answer...

Marine ecosystems are among the largest of Earth's aquatic ecosystems and are distinguished by waters that have a high salt content. These systems contrast with freshwater ecosystems, which have a lower salt content. 
hope it helps u...

Answer 2

the ecosystem of any water body is known as marine ecosystem. that is the living and non living things around the auqatic body is marine ecosystem .

eg. the lake ecosystem is an eg of marine ecosystem

hope this will help u