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Many of these issues are related to general inflexibilities associated with the GS pay system . The signs are related to the nervous system and resemble the signs seen with excessive consumption of nicotine ( tobacco ) : twitching , nervousness , depression , difficulty in moving and breathing , and loss of muscular control . The introductory course demonstrates how international and domestic issues are related . Then , we propose how relationships between these variables are related to habitat features for temporary populations . " The biggest differences between these animals and human beings are related to our respective environments . " Although Lantz currently focuses on solar convection , his interests include related areas of physics . Use JMP-In to calculate the correlation coefficient for these data and interpret both how the variables are related and what this relationship means .