What does it mean for an environment to be isotonic? (1 point)

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The concentration of solute in the environment and the concentration inside the cell are at equilibrium.
The concentration of solute is greater in the environment than inside the cell.
The concentration of solute in the environment is different from the concentration inside the cell.
The concentration of solute is greater inside the cell than in the
environment.

The concentration of solute in the environment and the concentration inside the cell are at equilibrium.