<span>It is the Earth's atmosphere that protects us from radiation and the vacuum of space - specifically UV radiation from the Sun, which can be very dangerous even with the atmosphere's intervention.
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The solute is the substance dissolved in water.
A hypotonic solution is a solution with a low concentration of solute.
A hypertonic solution is a solution with a high concentration of solute.
An isotonic solution is a solution that contains equal concentrations of solutes.
The direction of water displacement (or osmosis) depends on the total concentration of solute on each side of the membrane and not the nature of the solute.