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What is the sensory mechanism of animals that controls their responses to changes related to an impending earthquake? As mentioned earlier, the behavior of an animal might be ____ to changes in the magnetic field preceding a major earthquake and such changes may be sensed by energy transfer at the electron level which, in turn, cause changes in the cellular behavior, or response. The living cell is essentially an electrical device, and the ____ organs are all interconnected. Electromagnetic changes occurring prior to the ____ of a large earthquake may be sensed by certain animals and filtered, then ____ interpreted. Thus animals may have the means and ____ to sort out and discriminate the threatening pre-quake signals of an impending earthquake, thus activating a behavior pattern for ____ . These electromagnetic changes which ____ an earthquake, although mixed with background noise, must be filtered by animals and coordinated through their sensory response to the total environment. Thus, behavior is ____ by the sensitivity of the different component parts of the living system to the surrounding medium. Experiments with new instruments and electronic solid state sensors are being used now to determine animal response to impending catastrophic occurrences. The benefit from such research would be in ____ the sensory responses of animals to construct equally responsive instruments that can record or monitor these pre-quake changes. Thus, observing and studying animal behavior could lead to better earthquake ____ instrumentation.