A unicellular organism adapted to living in salt water is placed in a freshwater tank. What is the likely outcome?

The unicellular organism will most likely burst and die.

Explanation:

When an organism adapted to live in salt water conditions is placed in fresh water, the organism will take in excess water by osmosis. Osmosis is the process through which water moves from a region of higher concentration to a region of lower concentration.

As excess water will be taken in by the organism, the body of the unicellular organism will swell up and burst, causing the death of the unicellular organism.