Question

The principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater is _______.

Answer 1

The principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater is 'salinity'.

Answer 2

The correct answer is Salinity.

Salinity refers to the principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater. It is the measure of all the salts dissolved in water. It is usually measured in parts per thousand.