The correct terms to fill in the blanks based on the definitions provided are as follows:
A hypertonic solution is one that has a greater concentration of solute outside the cell, causing water to leave the cell to the outside environment.
B isotonic solution is a balanced solution where the concentration of solutes is equal inside and outside the cell.
C hypotonic solution is when the concentration of solute is greater inside the cell, causing water to move into the cell, which can potentially lead to the cell swelling or bursting.
So the complete sentences would be:
A hypertonic solution is one that has a greater concentration of solute outside the cell, and therefore a lower concentration of water. Water will leave the cell to the outside environment; this is one reason why organisms that live in freshwater cannot survive in saltwater, like the ocean. Water will leave the organisms' cells and eventually the cells will undergo plasmolysis and the organisms will die. An isotonic solution is a balanced solution where the solution concentration is balanced with the solution inside the cell. Finally, when a cell is surrounded by a hypotonic solution, the concentration of solute is greater inside the cell, and the concentration of water is greater outside; water moves into the cell, and the cell swells, and if enough water enters, the cell can burst.