Examlex
Which of the following is not a mechanical barrier against microorganisms?
Sun
The star at the center of our solar system, which is a source of light and heat for the planets orbiting around it.
Potential Energy
Potential energy is the energy held by an object because of its position relative to other objects, stress within itself, electric charge, or other factors.
Chemical Reaction
A process in which substances interact, leading to the formation of new substances with different properties.
Molecular Bonds
Molecular bonds are attractive forces that hold atoms together in molecules, including ionic, covalent, and hydrogen bonds among others.
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