Orthodontist
it prevents and corrects dehydration
Tendons are the structures that prevents valves from turning inside-out.
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Melanin
dna is that because the structures of what is does. and how it reacts
Antibodies.
there are valves in the vessels that prevents backflow, just like in the viens
A periodontist is the dental professional who works directly with gum tissue and the supporting structures under them (tooth roots, bones, and ligament tissue)
This is a Repetitive Stress Disorder (RSD). Thus, resting the injured areas allows for healing and prevents further injury. Crutches may assist in the healing process. Normally, this disorder corrects itself, so unless otherwise informed, consider it a temporary problem.
The papillary muscles and the chordae tendinae work to prevent prolapse of the AV valves. This prevents backflow of blood in the heart.
Organisms survive at certain pH levels. If the environment is too acidic or severely basic, it can wear away at their cellular structures, causing the organisms to die.
Technically, there is little you can do to prevent an earthquake. AN earthquake is absolutely harmless if you are not directly on the edge of a fault, it is man-made structures and natural occurrences like avalanches that make earthquakes dangerous. The solution to this is to simply stay away from tall structures or unsound physical features of the earth (like mountains or old forests.)