Question

Aquatic ecosystems can be classified as

freshwater and ocean ecosystems.

freshwater and marine ecosystems.

freshwater and estuary ecosystems.

marine and non-marine ecosystems.

Answer 1

@samanthagreer

Answer 2

@Ahsome

Answer 3

Hi @kittymeow101 !
The aquatic ecosystem can be primarily divided into freshwater and marine ecosystem. While the former contains more salt content and include sea and ocean, the latter include ponds, rivers, lakes etc.