Only the water of marine ecosystems contains dissolved salt.
a. true
b. false

Answer;

The above statement is false

Explanation;

It will be false to say that; Only the water of marine ecosystems contains dissolved salt. This is because dissolved salt may be found on other ecosystems apart from marine ecosystem.

Examples of such ecosystem include salt marshes, estuaries, intertidal zones, ,magrooves, lagoons,sea floor, coral reefs, and the deep sea. These environments are different from  freshwater ecosystems, which have a lower concentration of dissolved salt.However, Marine waters cover two-thirds of the surface of the Earth.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

i believe the answer is three water molecules